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Noise and the night-time cityCity noise, measured to the standard.
Noise from traffic, construction and nightlife harms sleep and health. Sound level meters at hot spots, with events classified at the edge and weather beside them, report to one record the environmental health team, planners and residents can trust.
Plan a deploymentHow it worksStation Builder- Industry
- Cities
- Measurements
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- Sources cited
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Cities · Noise and the night-time city
The noise that keeps people awake
Night noise from traffic, construction and venues wakes people and harms their health. Complaints arrive after the event, and officers rarely hear what residents heard. Meters at the hot spots, measuring to the standard, turn each complaint into evidence and each noise plan into a measurable one.
What is measured
Levels, events and weather
Sound level meters meeting their class measure levels continuously at the façades that matter. Each event is classified as traffic, music, construction, sirens or other at the edge, and weather sensors beside each meter show when wind or rain spoils a reading.
- Instruments
- Sound level meters · Edge event classification · Weather sensors
The base node
Levels leave, speech does not
Each node computes levels and averages, classifies events and flags weather-spoiled readings. It keeps no audio of speech, so the network measures noise without listening to people, and signs every value before it leaves. The privacy settings are verified at commissioning.
Radio and links
Cellular from the post
Noise points on poles and buildings report over the public cellular network with no cabling. Simple battery indicators on LoRaWAN extend coverage between full meters, and points on city buildings use the city’s fibre. Each meter buffers its data, so nothing is lost when a link drops.
- Links
- Public cellular · LoRaWAN · Fibre
How it works
From a complaint to an answer
A resident complains about construction before permitted hours. The officer opens the meter’s record for that morning: classified construction events, levels above the limit and calm weather. The contractor is told with the evidence, and the next morning’s record shows the change.
From order to operation · Order
Scope the noise plan and complaints
The scope reads the noise action plan, complaint history, venues and construction sites. Nexus Observatory Inc. returns the point plan by hot spot, the privacy design, the integration with complaints and planning systems and a price per point and per service.
Plan a deploymentFrom order to operation · Survey
Listen at the hot spots
Crews visit hot spots at the times complaints arrive, measure with a reference meter and choose positions at the façades that matter, clear of reflecting surfaces. They check power on street furniture and cellular coverage. They note local sources that could mislead the meters, and record every position for the design.
From order to operation · Permits
Posts, privacy and venues
Meters on posts and façades need the owners’ consent. A privacy assessment confirms no speech is recorded, and venues and residents are told what is measured. Every agreement is kept with the point. The assessment is shared with residents where the city chooses, and every consent is kept with the point.
From order to operation · Build
Build to the meter standard
Sound level meters meeting their class, weather sensors and nodes are built, tested together, calibrated and enrolled with their identities. Event classes and privacy settings are configured before installation. Each meter’s calibration certificate is kept with its record, and configurations are tested on the bench before installation.
Open the Station BuilderFrom order to operation · Install
Install at the façade
Crews mount meters at the agreed height and distance from façades, with windshields and weather sensors beside them, and connect power and cellular. Every point is photographed with its position recorded for the record. Positions are chosen so readings represent the homes they protect.
From order to operation · Commission
Calibrate and compare
Each node proves its identity. Meters are checked with an acoustic calibrator and compared with the reference meter used in the survey; event classification is checked against observed events. Alerts are tested to the environmental health team. Each point joins the record only when its checks pass.
From order to operation · Operate
Answer complaints with evidence
Officers see levels and classified events at each hot spot, answer complaints with the record, and act on construction beyond permitted hours or venues over their licence. Planners see night noise indicators against health guidelines. Every case is kept with its readings for review.
From order to operation · Maintain
Calibrate on schedule
Meters are checked with a calibrator on schedule and sent for laboratory verification as their standard requires, windshields replaced and positions rechecked. Every change is recorded, so noise series stay comparable. Spares are kept calibrated, so a meter away for verification is replaced the same day and series stay complete.
Book field servicesData products
For officers, planners and residents
Environmental health officers receive levels and classified events; licensing and enforcement teams receive construction and venue alerts; planners and health teams receive night noise indicators; residents receive public noise maps where the city publishes them. Each product carries its calibration.
See the data productsEvidence
Noise measured to the standard
Every reading, event and calibration is signed and kept. Meters meet the international sound level meter standard, mapping and action plans follow the European noise directive, and health comparisons follow WHO guidelines, so complaints and plans rest on the same evidence.
- Drawn against
- IEC 61672-1 · Directive 2002/49/EC · WHO environmental noise guidelines
What you get
Environmental exposure monitoring for health programmes
Heat, air and water exposure measurements around facilities and communities; no diagnosis or treatment. Delivered as managed service and data licence, for health authorities, hospital networks, employers. Scale: City to national. Service levels are written as numbers you can measure on your own dashboard.
Talk to salesNext step
Plan noise and the night-time city with us
Tell us the site, the measurements and the rules it answers to. We reply with a survey proposal, a design and a scope for noise and the night-time city. An engineer replies with a survey proposal and a scope, and the plan grows from one site to the network you need, at your pace.
Plan a deploymentOpen the Station BuilderOpen the Studio
01The place and its hazards
Where it runs, and what can go wrong.
Operating contextCities map environmental noise and act on it under noise rules, and environmental health teams answer complaints about construction, venues and traffic. Health guidelines show the harm of night noise. Sound level meters must meet their standard, and recording speech raises privacy issues.
Hazards
- Sleep disturbance and health effects from night noise
- Construction noise beyond permitted hours
- Complaints that cannot be verified
- Meters that record speech
- Wind and rain spoiling readings
02What must be measured
What, where, how often, and under which rules.
Each measurement names where it is taken, how often, and the public standard or regulation behind it. Numbers in the sources column open the cited source below.
| Measurement | Where | Cadence | Sources |
|---|---|---|---|
| Sound levels | Meters at hot spots: main roads, venues, construction sites | Continuous, with short and long averages | 12 |
| Noise source classification | The same meters, classified at the edge | Each event | 2 |
| Wind and rain | Beside each meter or nearby | Continuous | 3 |
| Night noise indicators | Each monitored area | Monthly and yearly | 42 |
03The observation stack
From one base unit to a network.
The same blocks at every scale: instruments and a base node, a site with its radio, a fleet run as one, and a network federated on the open protocol.
- 01
Base unit
A noise point: a sound level meter with a weather sensor, read by a small node that classifies events and signs every value.
Build a station → - 02
Site
A district: points at hot spots, reporting over cellular to the environmental health team.
Plan a site → - 03
Fleet
Every meter of a city run as one fleet, with one calibration process.
Managed offers → - 04
Network
Cities and environment agencies exchange noise data and indicators through open standards.
The open protocol →
- 01Acoustic sensor
- 02Compact weather station
- 03Micro node (Nano)
- 04Cellular modem/router
- 05Pole
Radio and links
Public cellular
Noise points on poles and buildings report over the public network, no cabling needed.
Radio and links
LoRaWAN
Simple battery noise indicators extend coverage between full meters.
Radio and links
Fibre
Points on city buildings use the city’s own fibre.
Edge computeEach node computes levels and averages, classifies events such as traffic, music, construction or sirens, flags readings spoiled by wind or rain and keeps no audio of speech.
PowerPoints draw from street-light or building power with a battery for gaps.
04How it works
From the instrument to the product.
One observation’s path, tier by tier, with the interface on every link and a bill of materials below; then how the one node grows to a site, a fleet and federated networks.
Noise and the night-time city: data path
– of 06
01 Instruments Measurement with sensor identity andcalibration 02 Node – Wrap in an observation envelope with timequality– Measure quality and uncertainty, attachquality flags– Buffer locally (store-and-forward when thelink drops) 03 Backhaul Commit with transactional outbox andpublish, delivered at least once 04 Site Consumer inbox deduplicates and applieseach record once into governed data 05 Data store Governed product through API, map orexport, correction-aware 06 Products IEC 61672OGC SensorThings APIDirective 2002/49/EC 07 Power and structure 01 Acoustic sensor SDI-12 · RS-485 · Ethernet 02 Compact weather station SDI-12 · RS-485 · Ethernet 03 Micro node (Nano) Ethernet · USB · Analogue I/O ·RS-485 · CAN 04 Cellular modem/router Ethernet · USB · RS-232 Site MQTT 5 with Sparkplug B Governed data store Versioned, correction-aware Levels and classified events by hotspot Construction and venue alerts Night noise indicators Public noise maps 05 Pole Ethernet RS-485 Ethernet LTE/NR| Item | Equipment | Data ports | Protocols | Power in |
|---|---|---|---|---|
| 01 | Acoustic sensorSound level meter, acoustic event detector or infrasound array element. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC |
| 02 | Compact weather stationAll-in-one or compact station for temperature, humidity, pressure, wind and rain at a site. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC |
| 03 | Micro node (Nano)Single-board or module-class node for sensor sites, gateways and low-power deployments. | EthernetUSBAnalogue I/ORS-485CAN | MQTT 5, OMA LwM2M, CoAP | PoE, 12 V DC, USB PD |
| 04 | Cellular modem/routerLTE or NR modem or router that uses a public carrier or private network as backhaul. | EthernetUSBRS-232 | 3GPP E-UTRA air interface, 3GPP NR air interface, OMA LwM2M | 12 V DC, PoE |
| 05 | PoleUtility, street or dedicated pole with clamp positions. | — | — | — |
How it scales
01 Instruments Arbitrary qualified sensors and instruments whosemeasurements are ingested with calibration, units,geometry, time, custody and uncertainty. ×n 02 Node The minimum useful deployable unit: server, ruggedappliance, radio node, sensor gateway, satelliteterminal, AI, scientific, vehicle or virtual node. Node Node agent 03 Site The minimum independently operable localgovernance and failure domain: one or more nodesplus local network, identity, policy, evidence,storage, products and operator surfaces.SITE
Node Node Node ×n 04 Cluster An optional scale or specialisation domain forscheduling, shared storage, accelerators or datalocality.CLUSTER
×n 05 Fleet Coordinates plans, acknowledgements,convergence evidence, update campaigns andcorrection propagation across nodes and sites.FLEET
Fleet controller ×n 06 Federation An exchange of products, capabilities, events orwork across approved, independently administeredtrust domains, using explicit trust, policy,data-locality, version and correction contracts.TRUST DOMAIN
TRUST DOMAIN
TRUST DOMAIN
×n Verifier Applications Data in the field Telemetry Control Data upstream Control Data upstream Control Exchange Evidence Events Exchange- Data in the field
- MQTT 5 with Sparkplug B; connectors for LoRaWAN, OPC UA and instrument buses.
- Telemetry
- OpenTelemetry OTLP.
- Control
- TLS 1.3 with mutual authentication; protobuf messages over gRPC or HTTP/2.
- Data upstream
- At-least-once publication with repeat-safe keys over the control channel or NATS JetStream; QUIC MAY be used on lossy links.
- Evidence
- DSSE-signed in-toto statements; SLSA provenance; SCITT transparency receipts.
- Events
- Event envelopes mapped to CloudEvents 1.0; channels described in AsyncAPI 3.
- Exchange
- OpenAPI 3.1; the OGC API family; SensorThings; STAC; WIS 2.0.
05From order to operation
Every step, from the first call to a running site.
The same crew and the same record carry the work from scope to maintenance.
- 01 Order
Scope the noise plan and complaints
The scope reads the noise action plan, complaint history, venues and construction sites. Nexus Observatory Inc. returns the point plan by hot spot, the privacy design, the integration with complaints and planning systems and a price per point and per service. 2
- 02 Survey
Listen at the hot spots
Crews visit hot spots at the times complaints arrive, measure with a reference meter and choose positions at the façades that matter, clear of reflecting surfaces. They check power on street furniture and cellular coverage. They note local sources that could mislead the meters, and record every position for the design.
- 03 Permits
Posts, privacy and venues
Meters on posts and façades need the owners’ consent. A privacy assessment confirms no speech is recorded, and venues and residents are told what is measured. Every agreement is kept with the point. The assessment is shared with residents where the city chooses, and every consent is kept with the point.
- 04 Build
Build to the meter standard
Sound level meters meeting their class, weather sensors and nodes are built, tested together, calibrated and enrolled with their identities. Event classes and privacy settings are configured before installation. Each meter’s calibration certificate is kept with its record, and configurations are tested on the bench before installation. 1
- 05 Install
Install at the façade
Crews mount meters at the agreed height and distance from façades, with windshields and weather sensors beside them, and connect power and cellular. Every point is photographed with its position recorded for the record. Positions are chosen so readings represent the homes they protect.
- 06 Commission
Calibrate and compare
Each node proves its identity. Meters are checked with an acoustic calibrator and compared with the reference meter used in the survey; event classification is checked against observed events. Alerts are tested to the environmental health team. Each point joins the record only when its checks pass.
- 07 Operate
Answer complaints with evidence
Officers see levels and classified events at each hot spot, answer complaints with the record, and act on construction beyond permitted hours or venues over their licence. Planners see night noise indicators against health guidelines. Every case is kept with its readings for review. 4
- 08 Maintain
Calibrate on schedule
Meters are checked with a calibrator on schedule and sent for laboratory verification as their standard requires, windshields replaced and positions rechecked. Every change is recorded, so noise series stay comparable. Spares are kept calibrated, so a meter away for verification is replaced the same day and series stay complete.
06Data products and integration
What it delivers, to whom, and into which systems.
Data products
- Levels and classified events by hot spotEnvironmental health officers
- Construction and venue alertsLicensing and enforcement teams
- Night noise indicatorsPlanners and health teams
- Public noise mapsResidents
Integration
- Complaints systemRecords are linked to each complaint by place and time.
- Licensing and permitsAlerts reach the teams that enforce construction hours and venue licences.
- Noise mappingIndicators feed the city’s strategic noise maps.
Exchanged through IEC 61672, OGC SensorThings API, Directive 2002/49/EC.
07Questions buyers ask
Before you scope it.
Does it record conversations?
No. It measures levels and classifies events at the node; no speech audio is kept.
Will it stand up as evidence?
Meters meet their standard and are calibrated on schedule, with every reading signed.
What about wind and rain?
Weather sensors beside each meter flag spoiled readings.
Can residents see it?
Where the city publishes it, as maps and indicators.
08Resources
The sources behind this page.
Public standards, regulations and guidance, cited where they apply. Each applies only where its jurisdiction or scope does.
- 1IEC 61672-1: Electroacoustics, sound level metersInternational Electrotechnical Commission
- 2Directive 2002/49/EC relating to the assessment and management of environmental noiseEuropean Union · 2002
- 3Guide to Instruments and Methods of Observation (WMO-No. 8)World Meteorological Organization
- 4Environmental Noise Guidelines for the European RegionWorld Health Organization Regional Office for Europe · 2018
09Related
Use cases and solutions.
SolutionEnvironmental exposure monitoring for health programmes
Heat, air and water exposure measurements around facilities and communities; no diagnosis or treatment.Solutions for cities →SolutionSensing as a Service
Observation networks designed, installed, operated and maintained for a monthly fee: weather, hydromet, air, seismic and environmental stations, with data delivered under a licence.Solutions for cities →10Cities: specialized fields
Other fields of this industry.
Specialized fieldUrban air quality
Reference stations and dense sensor networks for particles and gases, with weather to trace sources, calibrated against each other, on cellular and LoRaWAN, for street-level maps people can trust.The full field →Specialized fieldUrban heat and trees
Street-level temperature and humidity across neighbourhoods, tree soil moisture and heat-health alerts, on LoRaWAN across the city, so cooling and watering go where people suffer most.The full field →Specialized fieldStreets and mobility
Counts of people, bikes and vehicles, speeds, kerb use and junction safety by camera and radar processed at the edge, on private 5G and fibre, so streets are planned on evidence and privacy is kept.The full field →Specialized fieldPublic buildings and energy
Energy, heat and water meters, indoor air and comfort in schools, offices and pools, with weather for normalisation, on the buildings’ own networks behind a security gateway.The full field →Specialized fieldWaste and street services
Bin fill levels, collection routes, transfer station gas and weather, on LoRaWAN across the city, so crews empty what is full and the waste record follows from the work.The full field →Bring us the site.
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