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Institute for Social Vision Design
ISVD-LAB-001Active

Quiet City Project — Visualizing Urban Noise × Sensory Stress and Policy Proposals

Research that visualizes the urban sound environment from the perspective of individuals with sensory hypersensitivity and misophonia, developing a 'Sensory Stress Index.' The project demonstrates structural gaps in noise regulation and environmental justice deficits in Bunkyo Ward, Tokyo.

Research Domain

Environment

Research Lead

Naoya Yokota

Start Date

Feb 28, 2026 –

Background

Do you feel stressed by everyday noise but get told you're 'overthinking it'? The noise problem is not about individual sensitivity — it's an issue of urban design and institutional frameworks. Using Bunkyo Ward as our field site, we aim to create livable sound environments for everyone through noise data visualization and structural analysis of regulations.

Hypothesis(6)4/6
Fieldwork0/5
Analysis(11)1/4
Paper0/5
Outreach0/4

Research Artifacts

Progress map of frameworks and deliverables for each phase. Click a slot to expand related notes.

Hypothesis

4/6

Framework

Problem Map

diagramRequired

Deliverable

Fieldwork

0/5

Framework

Research Design

tableRequired

Data Collection Plan

tableRequired

Ethics Checklist

checklist

Deliverable

Fieldwork Notes

mdx[]Required

Raw Data

dataset

Analysis

1/4

Framework

Analysis Framework

tableRequired

Causal Loop Diagram

diagram

Deliverable

Data Visualization

dashboard

Paper

0/5

Framework

Paper Outline

documentRequired

Peer Review Plan

checklist

Deliverable

Research Report

mdxRequired

Policy Brief

mdx

Infographic

image

Outreach

0/4

Quiet City Report Vol.1 — Bunkyo Ward Sound Environment Fieldwork Report

mdx

Presentation

slides

Media Kit

document

Real-time Noise Map β

tool

Methodology

Research methodology and approaches adopted in this lab.

Fieldwork (Noise Measurement + Subjective Evaluation)

Measuring noise levels on residential streets, in parks, and in residential neighborhoods within Bunkyo Ward (文京区), while simultaneously collecting residents' subjective stress evaluations. The goal is to visualize the divergence between decibel values and sensory stress.

Tools & Methods
Sound level meter (Class 2)GISGEMA

Institutional Analysis

Analyzing the structure of the Noise Regulation Law (騒音規制法), the Basic Environment Law (環境基本法), and municipal ordinances to categorize structural regulatory gaps — sound sources excluded from regulation, such as everyday residential noise and low-frequency sound.

Tools & Methods
Legal databasee-GovComparative municipal ordinance analysis

Data Visualization and GIS Mapping

Overlaying the geographic distribution of noise measurement data and complaint counts to analyze the geographic concentration of noise harm and its correlation with socioeconomic factors.

Tools & Methods
QGISD3.jse-Stat API

International Comparative Institutional Analysis (NYC / France / London)

Comparing the institutional design, operational track record, and outcome data of NYC SoundVue / Local Law 7 of 2024, the Bruitparif Hydre sonic radar, and London's Low Traffic Neighbourhood programme, to establish a reference base for automated acoustic monitoring, spatial intervention, and ordinance design in the Japanese context. The analysis critically examines implementation gaps in each case — including NYC, where appropriations were not secured and deployment remained at nine cameras as of 2026, and Hydre, where progress on the spring 2025 verbalization phase requires ongoing monitoring.

Tools & Methods
NYC DEP annual reportsBruitparif public documentationOxford LTN study (Transportation Research Part D, 2024)

Glossary

Key terms and definitions used in this research.

Contrast Index (CI)
An event-based index at the conceptual design stage that describes noise stress as a multiplicative composite of contrast with background noise, repetition frequency, time-of-day weighting, and a source-type masking coefficient (M). This is a Phase 2 research sketch for the ISVD Quiet City Project; the M coefficients are designed to be updated post-hoc based on subjective evaluation data from Bunkyo Ward (文京区) fieldwork planned for autumn 2026 to spring 2027. This is a distinct direction from the 'dB-stress divergence index' discussed elsewhere, is not an established metric, and will be withdrawn if its independence from Zwicker Perceived Annoyance or ISO 12913 PA cannot be verified.
Related terms:Sensory Stress IndexSoundscape
Source
Environmental Justice
A principle and movement that seeks to correct structural imbalances in which environmental burdens are disproportionately borne by socially marginalized groups. The geographic concentration of noise harm is also a matter of environmental justice.
Related terms:Epistemic Injustice
GEMA (Geographic EMA)
Geographic Ecological Momentary Assessment. A research method that records real-time subjective experiences in conjunction with GPS location data. Particularly effective for field surveys of noise stress.
Related terms:Sensory Stress Index
Hyperacusis
A condition in which sounds of ordinary volume are perceived as unbearably loud. Frequently associated with sensorineural hearing loss and autism spectrum disorder.
Related terms:MisophoniaSensory Hypersensitivity
Low Traffic Neighbourhood (LTN)
A street engineering technique originating in London that physically excludes through-traffic using modal filters such as bollards, creating residential zones accessible only to residents and emergency vehicles. A 2024 Oxford University study found traffic within LTNs decreased by up to 51%, with corresponding reductions in noise levels.
Related terms:Modal FilterSensory Refuge Zone
Source

Bibliography

Detailed reference list for this research.

  • Le radar sonore « Hydre » (Sonic Radar Hydre)

    Bruitparif (2025)

    An automated acoustic measurement and enforcement radar developed by Bruitparif, building on the Méduse sensor technology. Phase 1 (2022) was demonstrated at three sites: the 20th arrondissement of Paris (20区), Villeneuve-le-Roi, and Saint-Lambert des Bois. Phase 2 (verbalization, penalty phase) was scheduled for spring 2025. Also under trial in Berlin, Geneva, Brussels, and Barcelona.

    Link

  • 2024 Annual Report for Noise Camera Enforcement Program

    New York City Department of Environmental Protection (2024)

    Annual report on the NYC noise camera programme. Local Law 7 of 2024 mandated expansion to 25 cameras across five boroughs by September 2025, but appropriations were not secured and as of 2026 only nine cameras are operational (per public reporting).

    Link

  • Local Law 7 of 2024 (City of New York)

    New York City Council (2024)

    An ordinance requiring the NYC DEP to install 25 noise cameras (5 per borough) by September 2025. Implementation is contingent on budget allocation due to the 'subject to appropriations' clause.

    Link

  • The impact of a low traffic neighbourhood intervention on urban noise measured with low-cost sensors in Oxford, UK

    (Oxford / University of Birmingham research team) (2024)

    Published in Transportation Research Part D. Measured pre- and post-LTN intervention with eight AudioMoth low-cost sensors, confirming noise reduction and increased biotic sound at almost all observation points. Traffic within the LTN decreased by up to 51%. Results on boundary roads were mixed (some -8%, some +3%).

    Link

  • Joint Prediction of Audio Event and Annoyance Rating in an Urban Soundscape by Hierarchical Graph Representation Learning

    Hou, Y. et al. (2023)

    Accepted at INTERSPEECH 2023. Simultaneously predicts acoustic event detection and annoyance ratings for urban soundscapes using hierarchical graph representation learning. Measures per-source-category annoyance contributions via Spearman correlation. Referenced as the literature prior for the M coefficient in the Contrast Index (CI).

    Link

Other Notes (9)

3
Analysis

Soundproofing Subsidies Choose Their Roads — The Disparity Structure of the Roadside Housing Soundproofing Program

Subsidies for soundproofing works exist for residential properties along arterial roads, but eligibility is subject to compound conditions including designated routes, year of construction, and application timing. This note examines the structural dynamic in which residents suffering equivalent noise harm are nonetheless excluded from subsidy coverage.

3
Analysis

Why Victims Stay Silent — The Social Psychology Behind the Failure of Collective Noise Complaints

Residents suffering from traffic noise remain stuck at individual complaints and never organize collectively. Behind this pattern lie the free-rider problem — 'someone else will act' — learned helplessness, and a thin sense of standing among people who are 'just trying to live normally.' This note examines the psychological mechanisms that produce complaint gap zones.

3
Analysis

Assessment Never Reaches the Field — Why Environmental Impact Assessment Fails to Control Road Noise

Road construction in Japan requires an Environmental Impact Assessment (EIA), yet noise evaluation stops at pre-construction predictions. There is no institutional guarantee of post-opening measurement follow-up. This note examines how the assessment system works and where its structural loopholes lie.

3
Analysis

EVs Are Too Quiet — The Paradox of Mandatory Acceleration Sound and Type Certification

As electric motorcycles and electric vehicles proliferate, international standard UN/ECE R138 mandates artificial sound emission at low speeds — creating a direct tension with urban noise reduction goals. This note reads the contradiction between noise regulation and pedestrian safety through the structure of type certification.

3
Analysis

Inside the Perpetrator Group — Why Self-Regulation Fails in the Noise Industry

The automotive and motorcycle industry blamed for noise pollution is internally divided into at least four tiers: manufacturers, aftermarket parts makers, dealerships, and user clubs. Because each tier pursues different interests, industry-wide self-regulation is structurally impossible.

3
Analysis

The Learning Curve of Nine Noise Lawsuits — From the Tolerable Limit Doctrine to a ¥5.9 Billion Verdict

From the Supreme Court's 1967 tolerable limit doctrine to the Yokohama District Court's 2024 Fifth Atsugi Base Noise Lawsuit awarding approximately ¥5.9 billion in damages, Japan's noise litigation has evolved from individual grievances with token compensation to mass-plaintiff suits producing verdicts in the hundreds of millions. Nine cases, one learning curve.

3
Analysis

WHO 2018 Environmental Noise Guidelines vs. Japan's Standards — What a Gap of Up to 25 dB Actually Means

The WHO Regional Office for Europe's 2018 environmental noise guidelines identify road noise at Lden 53 dB and above as raising the risk of heart attack and stroke, and recommend nighttime Lnight below 40 dB. Japan's environmental quality standards permit 45 dB at night in residential zones and 65 dB at night along arterial roads. This note reads the gap against the health-effects research.

3
Analysis

A Proposed Industry Responsibility Clause for the Municipal Soundscape Ordinance Model

Can adding an Industry Responsibility Clause move noise governance beyond the limits of enforcement alone? Drawing on the hypothetical municipal soundscape ordinance model (equivalent to 25 existing articles, plus a proposed addition) that ISVD is developing at the research stage, this essay examines a four-part Industry Responsibility Clause — covering recognition, declaration, dialogue, and certification — against existing ordinance compatibility and international precedent. A research-stage institutional design sketch, including pathways for joint declarations with quiet-riding motorcyclists.

3
Analysis

Quantitative Comparison of Noise Ordinances Across Tokyo's 23 Special Wards — Implementation Divergences in Penalties, Time Restrictions, Source Categories, and Resident Petition Protocols

This note conducts a cross-sectional comparison of noise-related ordinances across Tokyo's 23 special wards, examining implementation divergences along five axes: penalty structure, time restrictions, source categorization, business responsibility provisions, and resident petition protocols. Official ordinance texts and ward-published guidance serve as primary sources. The analysis presents the structural finding that while all 23 wards operate under the shared foundation of the Tokyo Metropolitan Environmental Preservation Ordinance, meaningful divergence emerges in the operational layers of late-night business regulation, loudspeaker restrictions, and daily-life noise response.

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