Abécédaire

The imposition of a dominant group's soundscape onto colonised or occupied spaces, displacing indigenous sonic cultures, languages, and rituals. Includes the use of loudspeaker announcements, military noise, demolition, and construction to assert territorial control and erase local acoustic identity.

A regime of massive, iterative, and invasive linguistic, ambient, social, and technological mechanisms that alter and disrupt the lifeways of an Indigenous territory. Three dimensions: (1) sociolinguistic domination — the marginalisation of Indigenous languages (linguicide); (2) media and technology systems — colonial representation through radio and digital platforms; (3) industrial and infrastructural noise imposed on Indigenous lands.

The shared sonic environment understood as a common resource — like clean air or public space — to which communities have collective rights and responsibilities. Noise pollution is, in this framing, a form of enclosure: the appropriation of shared acoustic space by private interests.

The practice of producing crowdsourced, community-generated noise maps that contest, supplement, or expose the limitations of state-issued or model-based official maps. Where official strategic noise maps use computational modeling from traffic counts and infrastructure data, acoustic counter-maps use direct measurement by residents — capturing what models systematically miss, including local sources, temporal variation, and the lived acoustic reality of underserved areas.

The study of the relationship between living organisms — including humans — and their sonic environment. Founded by Canadian composer R. Murray Schafer and the World Soundscape Project in the 1970s. Concerned with the cultural, ecological, and perceptual dimensions of sound and listening.

The documented, unbroken record of how an audio recording was captured, stored, and transmitted — establishing that it has not been altered, fabricated, or tampered with. Essential for the use of smartphone recordings as primary evidence in legal proceedings, environmental hearings, and human rights tribunals. Governed by ISO/IEC 27037 (digital evidence handling) and equivalent national forensic standards.

The political values, assumptions, and interests embedded in how sounds are classified as noise or music, nuisance or culture, pollution or heritage — and how these classifications are institutionalized in noise maps, ordinances, zoning, and enforcement practice.

Noise pollution violates two forms of freedom simultaneously. Negative liberty (freedom from): the noise imposed by infrastructure or an operator constitutes an external interference with your living space. Positive liberty (freedom to): the capacity to realise oneself and participate in collective life — destroyed by chronic sleep deprivation, impaired concentration, and the degradation of spaces for public conversation.

Bernie Krause's hypothesis (1993) that in a healthy, undisturbed ecosystem, organisms evolve to occupy distinct acoustic niches — specific frequency bands and time windows — so that their communication signals do not interfere with those of other species. Krause's broader framework divides the soundscape into geophony (non-biological natural sounds: wind, water, thunder), biophony (biological sounds), and anthrophony (human-generated sounds). The niche partitioning component is a hypothesis with supporting evidence in some taxa (insects, some bird communities) but contested in its universal form across all species.

The racialised and class-based inequities embedded in how noise is produced, tolerated, regulated, and weaponised. Acoustic racism names the ways that noise pollution is disproportionately imposed on Black, Indigenous, and low-income communities; that the sounds of racialised communities are policed and criminalized; and that the legal and planning systems that govern noise systematically protect white and wealthy spaces.

The process by which urban and social spaces are marked, claimed, and contested through sound. Noise is not merely a byproduct of urban life but an active territorial force — asserting presence, enforcing borders, and shaping who belongs where.

Sudden or permanent damage to the auditory system caused by exposure to extremely loud sounds, typically above 130 dB(A). Can result in immediate and irreversible hearing loss.

A technique for locating the origin of a sound by comparing the time at which the same acoustic event is recorded at multiple distinct points. Because sound travels at ~343 m/s, a difference of even a few milliseconds between two recordings indicates the recording point closer to the source heard the sound first.

A Mapuche concept meaning 'to listen attentively' — a form of listening that resists the colonial ear by dwelling on what dominant perceptual practices have been trained to ignore. At once an aesthetic and a political counter-practice.

The background noise present in a given environment, composed of all sources combined — traffic, wind, human activity, mechanical systems. It forms the acoustic baseline of a place.

Acoustic spaces — physical, mediated, or networked — in which marginalized communities produce, circulate, and contest sound outside the dominant public sphere. Derived from Nancy Fraser's critique of Habermas and Michael Warner's theory of publics, the concept names the sonic dimension of counter-public formation: the freedom to make noise on your own terms.

The critical point in a far-from-equilibrium system where a fluctuation — even small — can trigger an irreversible change of state: either toward a new, more resilient order or toward disintegration. In acoustic context: the moment when a community's citizen noise documentation tips into systemic advocacy — or when a body's noise exposure tips past the threshold of irreversible harm.

A form of popular protest in which participants bang pots, pans, and other domestic objects to create a collective, decentralized noise that reclaims public space, disrupts institutional sound authority, and asserts popular presence. The cacerolazo is a sonic weapon of the household, turning the most mundane objects of domestic life into instruments of political rupture.

The documented physiological pathways by which chronic noise exposure contributes to hypertension, coronary artery disease, stroke, and other vascular conditions.

A citizen's recording of an acoustic environment is not a neutral document: it is a partial, situated, re-lived archival object that carries the memory, interpretation, and lived experience of its author. The citizen sonic archive is simultaneously evidence and testimony.

Classification of sound level meters by precision grade under the current IEC 61672-1:2013 standard. Class 1 (precision grade) has a tolerance of ±1.1 dB at 1 kHz; Class 2 (general purpose) has a tolerance of ±1.4 dB at 1 kHz. Tolerances widen significantly at frequency extremes. Legal and regulatory noise measurements typically require Class 1 instruments. Note: the older ANSI terminology used 'Type 1 / Type 2' — IEC 61672 replaced this with 'Class 1 / Class 2.'

A research and action practice grounded in reciprocity: listening with communities rather than extracting sonic data from them. Co-listening refuses the expert-listener position that harvests, analyses, and returns knowledge; it demands a mutual conversation in which practitioner knowledge is epistemically equal to academic knowledge.

The documented impairment to children's reading, memory, attention, and language acquisition caused by chronic exposure to environmental noise above 55 dB(A).

A distributed network of citizen-operated recording devices — smartphones, AudioMoths, fixed microphones — deployed and owned by a community rather than an institution, producing continuous acoustic data that simultaneously documents biodiversity, noise pollution, environmental inequality, and social wellbeing. The most ambitious form of acoustic counter-mapping.

The study and documentation of sound in armed conflict environments — including explosions, gunfire, artillery, air raids, drone noise, and acoustic weapons — and the distinct health consequences for civilian populations living in or near conflict zones.

Noise that remains at a relatively stable level over time, without significant fluctuations or interruptions. Highway traffic, industrial machinery, HVAC systems, and data centres are archetypal continuous noise sources. Contrasted with intermittent noise (irregular events) and impulse noise (brief high-energy spikes).

The practice of redirecting the epistemic and legal power of forensic methods — traditionally reserved for state institutions — toward the investigation and documentation of state violence, corporate harm, and institutional accountability failures.

A frequency-weighted measurement of sound pressure level that approximates the human ear's sensitivity across frequencies. The standard unit for environmental and occupational noise measurement.

A methodology in which multiple independent recording devices — operated by different people, at different positions — simultaneously document the same acoustic event, producing a multi-perspective archive whose spatial and temporal redundancy is harder to suppress, dismiss, or counter than any single recording. The synthesis that transforms noise documentation from personal testimony into collective civic evidence.

A field methodology in which multiple smartphone recordings are made at spatially distributed points along a route — a transect — and combined to produce a composite acoustic portrait of how sound moves through a landscape, rather than how a single location sounds at one moment. Borrowed from ecological transect methodology and extended into urban and political contexts.

The political arrangement that determines whose sounds are heard, recognized, amplified, or suppressed in a given social and urban order. By analogy with Jacques Rancière's 'distribution of the sensible,' it names the prior sonic partition that determines who counts as a subject and whose expression is heard as legitimate speech rather than mere noise.

The quantified relationship between the level and duration of noise exposure (the dose) and the probability of a health outcome (the response), such as annoyance, sleep disturbance, cardiovascular disease, or hearing loss.

The use of acoustic memory — the recollection of sounds, echoes, durations, and rhythms — as forensic evidence in the absence of visual documentation or physical access to a site. Developed by Forensic Architecture in their investigation of Saydnaya Military Prison, Syria.

The European Court of Human Rights has established, through a series of cases beginning with Powell and Rayner v. UK (1990) and culminating in Hatton and Others v. United Kingdom (Grand Chamber, 2003), that states have positive obligations under ECHR Article 8 (right to respect for private and family life and the home) to take reasonable measures to protect individuals from severe noise pollution. This makes acoustic protection a justiciable human right in Council of Europe member states.

The scientific discipline studying the role of sound in ecosystems — how organisms communicate through sound, how human-generated noise disrupts these communications, and how acoustic indices can measure ecosystem health without direct observation of individual species.

An atmospheric condition in which sound is deployed to produce a diffuse affective tonality of dread, dislocation, and permanent surveillance — without direct physical contact. The sonic environment itself becomes an apparatus of territorial control.

The principle that environmental burdens — including noise pollution — are inequitably distributed along lines of race, class, and geography, and that affected communities have the right to remedy.

EU Directive 2002/49/EC relating to the assessment and management of environmental noise. Requires member states to produce strategic noise maps for major roads, railways, airports, and agglomerations, and to develop noise action plans based on those maps.

The constant noise level that, over a given measurement period, contains the same total acoustic energy as the fluctuating noise measured. The standard metric for assessing average noise exposure.

The practice of aggregating noise measurements from thousands of independently operated devices into a shared, open dataset that no single institution could produce alone. Community-contributed data compensates for the spatial and temporal sparsity of official monitoring networks.

The practice of acoustic investigation that uses sonic evidence — spectrograms, frequency analysis, earwitness testimony, sound trajectory reconstruction — to establish facts about violence and state crime in legal and human rights contexts. Developed primarily by artist and 'private ear' Lawrence Abu Hamdan.

Forms of noise-based harassment, intimidation, or silencing disproportionately targeting women and gender-nonconforming people: catcalling, amplified threats in public spaces, street audio surveillance, and the use of noise to restrict freedom of movement. Includes institutional sonic environments designed around male-default norms that render women's voices and needs invisible.

The process by which rising property values, urban renewal, and the arrival of higher-income residents leads to selective enforcement of noise ordinances and zoning regulations that silence or displace the cultural expressions, businesses, and communities of existing, often lower-income, residents.

There is no global burden of disease estimate for environmental (non-occupational) noise equivalent to the WHO/Europe 2011 report. The Global Burden of Disease study does not include environmental transportation noise as a disease risk factor. This is a structural absence: the communities bearing the heaviest noise burdens — in rapidly urbanising cities in South Asia, Southeast Asia, Sub-Saharan Africa, and Latin America — are the least represented in the global epidemiological literature.

The deliberate deployment of sound in public and semi-public spaces to deter, exclude, or expel specific populations — typically homeless people, youth, migrants, or the poor — without resorting to visible physical barriers or explicit discriminatory policy.

A chronic condition characterised by an abnormally reduced tolerance to ordinary environmental sounds that others find acceptable. Affects approximately 9% of adults, often co-occurring with tinnitus and following noise-induced cochlear damage.

Short-duration, high-amplitude sounds characterised by a rapid rise time — typically less than 200 milliseconds. Examples include gunshots, explosions, pile driving, and industrial impacts. Regulated separately from continuous noise because of their distinct damage mechanism.

Borrowing from John Cage, indeterminacy designates the condition of a sonic event whose outcome cannot be fully predicted or controlled by any single author. Applied to the city: the urban soundscape is an indeterminate score — no one composed it, no one controls its outcome.

Sound at frequencies below 20 Hz — beneath the threshold of normal human hearing. Although inaudible to most people, infrasound is physically felt and can cause physiological effects including disorientation, nausea, anxiety, and what researchers call 'presence phenomena' at sufficient intensity.

Day-Evening-Night Level (Lden) is the primary noise indicator used in EU environmental noise regulation. It averages sound exposure across 24 hours, applying a 5 dB penalty to evening hours (19:00–23:00) and a 10 dB penalty to night hours (23:00–07:00) to account for increased sensitivity during those periods. Lnight covers only the night period.

The philosophical proposition that how we listen — with what attention, from what position, toward whom — is an ethical and political practice. Developed by Salomé Voegelin as a philosophy of sound that refuses to separate sonic experience from political responsibility.

The subjective magnitude of sound as perceived by the human auditory system, measured in sones. One sone is defined as the loudness of a 1 kHz tone at 40 dB SPL. Doubling the sone value corresponds to a perceived doubling of loudness, which requires approximately 10 dB more acoustic power.

Sound energy concentrated in the frequency range below approximately 200 Hz. Includes infrasound (below 20 Hz, inaudible to most humans). Sources include industrial machinery, wind turbines, HVAC systems, road traffic, and aircraft. Propagates farther and penetrates building structures more readily than higher-frequency noise.

A directed-energy acoustic weapon manufactured by Genasys Inc. (formerly LRAD Corporation), capable of projecting sustained, high-intensity sound in a narrow beam over distances up to 3 km. Used by military forces, law enforcement, and maritime security for crowd dispersal, communication, and targeted harassment. Maximum specification: 162 dB SPL at source (LRAD 2000X); causes permanent hearing damage, tinnitus, vestibular disorders, and psychological trauma.

A Japanese concept designating the interval — the pause, the gap between sounds — as a charged, inhabited space, not mere absence. Ma is not silence: it is the qualitative duration between sonic events, the place where acoustic meaning deposits and prepares itself.

The application of machine learning to the automatic identification of sound events, acoustic scenes, and audio content. Models are trained on large labelled datasets (such as Google's AudioSet with 521 classes) and can label a sound clip with its source category — sirens, construction, birdsong, crowd noise — in real time.

The phenomenon by which the audibility of one sound is reduced or eliminated by the presence of another, louder sound. Environmental noise masking degrades speech intelligibility, music perception, warning signal detection, and communication in everyday life.

A commercially manufactured electronic device that emits a continuous tone at approximately 17.4 kHz, a frequency range audible to children and young adults (roughly under 25 years) but inaudible to most adults over 30. Deployed in public spaces — shopfronts, transport hubs, parks, car parks — to make loitering physically uncomfortable for young people without triggering legal frameworks designed for targeted discrimination or assault. The Council of Europe Parliamentary Assembly (2010, Doc. 12378) called for a ban, finding the device breaches ECHR Article 8 (right to private life) and Article 14 (non-discrimination by age).

The process of aligning multiple independent recordings of the same acoustic event — taken from different positions, devices, and times — into a unified temporal reference, enabling cross-comparison, triangulation, and contradiction-detection.

Environmental noise occurring during nighttime hours (typically 23:00–07:00) that disrupts sleep and causes physiological stress responses even without waking the individual.

Emerging evidence links chronic exposure to traffic noise with increased risk of type 2 diabetes, independently of air pollution and socioeconomic factors. The proposed mechanism follows the cardiovascular pathway: chronic nocturnal noise-triggered cortisol and adrenaline release disrupts glucose metabolism and promotes insulin resistance over time.

A defined psychoacoustic and public health category describing the subjective distress — irritability, helplessness, anger — caused by unwanted sound. Recognized by the WHO as a health outcome in its own right.

Jacques Attali's theoretical framework, developed in 'Bruits' (1977), arguing that noise — and its organisation into music — is a mirror of political power. In his reading, the control of sound is the control of society: noise is what threatens order; music is noise that has been disciplined and commodified.

A theoretical reframing, developed most systematically by Marie Thompson (2017), that refuses to define noise as the negative of signal. Instead of treating noise as something to be eliminated or reduced, this framework examines it as a productive, transformative force that breaks down binary structures — signal/noise, music/silence, speech/chaos — and acts directly on the nervous system, bypassing the intellectual filters that mediated language requires.

Unwanted or harmful sound in the environment caused by human activity — transportation, industry, construction, and urban density — that disrupts ecosystems, health, and quality of life.

An individual trait reflecting the degree to which a person is affected by environmental noise independent of actual exposure levels. A high noise-sensitive individual will experience greater annoyance, sleep disruption, and health effects at the same objective dB level as a less sensitive person.

Permanent, irreversible sensorineural hearing loss caused by cumulative exposure to high levels of noise. The most common occupational disease worldwide.

The totality of sounds produced by a military or colonial occupation in a given territory: surveillance drones, armoured vehicles, checkpoint intercoms, demolition machinery, and settler construction. The occupation soundscape functions as continuous acoustic evidence of control and can constitute a form of psychological violence.

Sound exposure encountered in workplace settings that, over time, causes permanent hearing damage, tinnitus, and associated psychological effects. The leading cause of preventable hearing loss worldwide. NIOSH recommends an exposure limit of 85 dB(A) as an 8-hour time-weighted average; OSHA's permissible limit is 90 dB(A).

Low-cost, open-source hardware devices designed for continuous, unattended acoustic monitoring — filling the gap between smartphone measurements (mobile, opportunistic) and professional monitoring stations (expensive, sparse, institutionally controlled).

Community-based approaches to environmental noise measurement in which residents — rather than regulators — collect, share, and interpret acoustic data using smartphones or low-cost sensors. Part of the broader citizen science and environmental justice movements.

The deployment of recording devices — autonomous recording units (ARUs), hydrophones, or smartphones — to continuously capture environmental sound without human presence, enabling long-term, large-scale biodiversity surveillance, noise impact assessment, and ecosystem change detection at costs inaccessible to traditional survey methods.

The use of sound-producing weapons, devices, and tactics by law enforcement as tools of crowd control, punishment, and intimidation — including LRADs, flash-bang grenades, rubber bullet launchers, low-flying helicopters, and high-intensity sirens. Acoustic violence by police causes permanent hearing loss, vestibular damage, PTSD, and panic injuries in bystanders, journalists, and protesters who are not its intended targets.

The deliberate use of amplified sound, chanting, music, or crowd acoustics as a tool of intimidation, territorial claim, or psychological pressure by organised political actors, extremist movements, or paramilitaries.

A composite perceptual metric that combines loudness, sharpness, and roughness into a single index reflecting how unpleasant a sound is, beyond what its SPL alone would predict. Developed by Zwicker and Fastl, and standardised in the field of sound quality engineering.

Areas designated under the EU Environmental Noise Directive (Article 8) as zones to be protected from increases in noise. May include urban parks, rural landscapes, or residential zones of particular acoustic value.

Canadian composer R. Murray Schafer coined the term 'soundscape' and founded the World Soundscape Project (WSP) at Simon Fraser University in 1969 — the foundational institution of acoustic ecology as a field. His 1977 book The Tuning of the World (republished as The Soundscape: Our Sonic Environment and the Tuning of the World) remains the discipline's primary text. Schafer introduced 'keynote sounds' (background acoustic identity of a place), 'soundmarks' (acoustically distinctive local sounds equivalent to landmarks), and the distinction between 'hi-fi' (wide dynamic range, quiet background, individual sounds distinguishable) and 'lo-fi' soundscapes (urban noise compression that masks individual acoustic events).

The pathology caused by cumulative exposure to the continuous vibrations of railway travel, recognised in British medical literature from the mid-19th century as a public health risk. The first documented case of physiological damage caused by continuous, imperceptible vibration — the direct historical precursor of modern chronic acoustic trauma.

The proposition — distinct from the legal right against self-incrimination — that individuals and communities have a fundamental right to experience acoustic quiet, and that this right entails positive obligations on governments to protect sonic environments from commercial, industrial, and institutional noise.

A psychoacoustic metric quantifying the perceived 'roughness' or 'harshness' of a sound caused by amplitude modulation in the 15–300 Hz range, measured in asper. Maximum roughness occurs at modulation rates of around 70 Hz.

The progressive global erasure of sonic diversity — distinct from species extinction, though intimately linked. Sensory extinction designates simultaneously the impoverishment of soundscapes (fewer species, fewer acoustic behaviours, reduced spectral richness) and the correlative diminishment of human capacity for attentive perception of a rich sonic world.

A psychoacoustic metric that quantifies the perceived 'brightness' or 'cutting' quality of a sound, measured in acum. A pure tone at 1 kHz at 60 dB has a sharpness of 1 acum by definition. Higher frequency content produces greater sharpness.

The boundary between meaningful signal and unwanted noise is not a natural acoustic fact: it is a cultural operation — a filtering technique that reflects and reproduces power relations. What is classified as 'noise' is the result of a political choice, contestable and historically variable.

The deliberate use of sound recording, field recording, acoustic mapping, and sonic practice as tools of political organizing, evidence-gathering, and community power. Sonic activism distinguishes itself from sound art (which centers aesthetic experience) and from technical noise monitoring (which centers data accuracy) by centering the political goal: building community capacity to contest acoustic injustice.

A framework, developed by researcher Alexandra Downing Watkins at the University of Cape Town, that names noise pollution as a direct continuation of racial and colonial geography. In post-apartheid Cape Town, forced eviction and relocation policies displaced communities to peripheral Temporary Relocation Areas — where residents face extreme noise exposure from proximity to industrial infrastructure and transport corridors, with no political recourse. The sonic conditions of these spaces are inseparable from their racial and economic production.

The explosive acoustic shock wave produced when an object — typically a military aircraft or spacecraft re-entry vehicle — exceeds the speed of sound. The characteristic double-boom (N-wave) can reach 65–200+ Pa overpressure (130–140+ dB SPL) at ground level, sufficient to shatter windows and cause structural damage.

The forcible, unwanted intrusion of sound into a person's phenomenological space through personal audio devices — most commonly headphones — as a form of intimate acoustic violence. Theorized by Jacob Kingsbury Downs (2021), sonic flooding names the weaponization of consumer audio technology to override a person's sensory autonomy from within: the attacker controls the sound environment that the victim experiences as private and interior.

The condition of unjust inequality in both noise exposure and access to high-quality, beneficial sound environments. Defined in a 2023 systematic review as a dual burden: marginalized communities face disproportionately high exposure to harmful noise and disproportionately low access to restorative soundscapes — quiet parks, green spaces, acoustically sheltered public areas.

Audio recordings, noise measurements, and acoustic analyses used as evidence in legal, journalistic, or historical documentation of violence, oppression, or environmental harm. Sonic testimony can substantiate claims of sonic warfare, workplace noise violations, police brutality, and environmental racism when traditional visual or textual evidence is absent.

The deliberate weaponisation of sound — by states, militaries, and security forces — to control, disorient, disperse, injure, or psychologically degrade human subjects. Coined theoretically by producer and scholar Steve Goodman (kode9), sonic warfare encompasses acoustic crowd-control weapons, military torture by music, infrasonic harassment, and the broader mobilisation of vibration as a medium of power.

The paradigm, rooted in 1930s applied psychoacoustics and behaviorist psychology, that specific sounds can reliably produce specific behaviors in predictable ways — a logic that connects Muzak piped into factories, commercial ambient music in retail environments, and acoustic weapons used in crowd control and interrogation.

A logarithmic measure of the effective pressure of a sound relative to a reference value (20 μPa, the threshold of human hearing). Expressed in decibels (dB). The foundational quantity from which all noise metrics are derived.

The governing strategies, institutional practices, and community mobilizations through which sound is classified, regulated, and contested in urban and political life. The term, developed by Leonardo Cardoso through ethnographic study of São Paulo, insists that acoustic regulation is always a form of social administration — never neutral.

The acoustic environment as perceived and experienced by a person or community in context — encompassing not just measurable sound levels but meaning, memory, identity, and wellbeing.

A two-dimensional visual representation of how the frequency content of a sound changes over time. The horizontal axis is time, the vertical axis is frequency, and colour or brightness encodes amplitude at each time-frequency cell.

A standardized metric (ANSI S3.5) that quantifies the proportion of speech information that reaches a listener given the background noise level in a specific frequency band. An SII of 1.0 means all speech is intelligible; 0.0 means none. In noise-justice contexts, SII calculation demonstrates mathematically that industrial or traffic noise actively denies communities the right to verbal communication, public assembly, and democratic participation.

Large-scale noise exposure maps required under the EU Environmental Noise Directive for major transport infrastructure and urban agglomerations. They show the distribution of population exposed to different noise levels and form the basis for noise action plans.

The perception of sound — ringing, buzzing, hissing, roaring — in the absence of an external acoustic stimulus. A common consequence of noise-induced cochlear damage.

The systematic distortion in machine learning audio classifiers that results from training data drawn disproportionately from specific geographies, recording conditions, and cultural contexts — causing models to perform unevenly across the full range of human acoustic environments.

An experimental methodology that adapts the Spatial Volumetric Impulse Response (SVIR) technique — developed in architectural acoustics and acoustic ecology — to a single smartphone, using controlled transient sounds (mechanical claps, spring-loaded clickers) to map the acoustic geometry of a physical space through its reflections, without specialist hardware.

The empirically documented spatial correlation between aviation-related noise exposure, low tree canopy coverage, and demographic marginalization — specifically race and income. Communities that bear the highest aviation noise burdens are the same communities with the least access to tree cover that would partially mitigate that noise, compounding both acoustic and ecological disadvantage along racial and economic lines.

Anthropogenic sound introduced into marine environments — oceans, rivers, and lakes — that disrupts or harms aquatic ecosystems. Major sources include commercial shipping, military sonar, seismic airgun surveys, offshore construction, and motorized recreational watercraft.

Sound level measurement without frequency weighting (dBZ) or with C-weighting (dBC), which captures the full acoustic energy of a signal including low frequencies that A-weighting systematically suppresses. Critical for documenting low-frequency industrial noise from shipping yards, data centers, wind turbines, HVAC systems, and heavy infrastructure that causes documented health harm while remaining invisible to standard dB(A) monitoring.

An urban intervention strategy that uses data mapping to identify precisely located pressure points for high-leverage, small-scale actions — too small for megaprojects, but numerous and well-distributed enough to transform a city's resilience cumulatively. Against top-down planning: acupuncture, not surgery.

The US Noise Control Act of 1972 was the only comprehensive federal noise legislation in US history. It established the EPA Office of Noise Abatement and Control (ONAC), empowered the EPA to set noise emission standards for major sources (transportation, construction, motors), and required noise labelling on products. In 1981, the Reagan administration eliminated all federal funding for ONAC, effectively dismantling the federal noise regulatory framework. The Act remains technically on the books but is entirely unfunded and unenforced.

A philosophical proposition that vibration is ontologically prior: all matter vibrates, and entities encounter one another through vibrational force before conscious perception. 'You need not hear a sound in order to feel it.' The politics of sound is therefore a politics of frequency — who controls which vibrations colonise which bodies and spaces.

The World Health Organization's evidence-based recommendations for maximum environmental noise levels, designed to protect human health across transport, industrial, and leisure noise sources.