--- title: "Classroom air and ventilation monitoring | Nexus Observatory" description: "Crowded classrooms get stuffy fast: carbon dioxide rises, attention falls and infections spread more easily. Sensors in every room show when to open windows…" url: https://observatory.global/industries/education/classroom-air/ publisher: Nexus Observatory Inc. updated: 2026-11-02 --- [Nexus Observatory](https://observatory.global/) / [Education](https://observatory.global/industries/education/) / [Specialized fields](https://observatory.global/industries/education/fields/) / **Classroom air and ventilation** # Fresh air in every classroom, measured. Crowded classrooms get stuffy fast: carbon dioxide rises, attention falls and infections spread more easily. Sensors in every room show when to open windows or run ventilation, help facility teams fix rooms that never clear, and give schools evidence of the air their students breathe. [Plan a deployment](https://observatory.global/contact/deployment/) How it works [Station Builder](https://observatory.global/studio/builder/) **Industry**: Education **Measurements**: 4 **Sources cited**: 4 1. Education · Classroom air and ventilation Stuffy rooms, tired students Crowded classrooms get stuffy fast. Carbon dioxide rises, attention falls and infections spread more easily, and many ventilation systems do not work as designed. Parents increasingly ask about the air their children breathe, and schools have little evidence to answer with. 2. What is measured Every room's air A sensor at breathing height in every classroom measures carbon dioxide, temperature, humidity and particles, and an outdoor sensor measures the particles that come in when windows open, so each room has its own record. Every instrument keeps its calibration and position with the site record. InstrumentsRoom air sensors · Outdoor particle sensor 3. The base node A simple signal The node turns each room's readings into a simple signal for teachers, computes ventilation performance from how fast carbon dioxide falls after lessons, flags rooms that never clear and advises when outdoor pollution means windows should stay shut. Every value is signed at the node before it leaves. 4. Radio and links No cables in classrooms Room sensors reach one gateway per school over a low-power link, with no cabling and years of battery life. The node joins the school network to reach facility teams, dashboards and, where they exist, ventilation controls. When one path fails, the other carries the data. LinksLoRaWAN · Wi-Fi 5. How it works From a stuffy room to a fixed fan A science room shows carbon dioxide climbing in every lesson and never clearing between them. The node flags it; facilities find a failed ventilation fan and replace it. The next week the room clears between lessons and teachers see the signal turn green. 6. From order to operation · Order Scope with the facilities team The scope reads the district's schools, room counts, ventilation types and complaints. Nexus Observatory Inc. returns the sensor plan, displays for teachers, facility reports and a price per room and per year. The scope is agreed before any site work begins. [Plan a deployment](https://observatory.global/contact/deployment/) 7. From order to operation · Survey Survey rooms and systems Crews survey representative rooms with facility staff: sensor positions away from windows and doors, ventilation systems and their controls, gateway coverage and network access. Findings shape the kit for each site before anything is built. Every finding is kept with the site record for the crews who follow. 8. From order to operation · Permits School approval The school and district approve installation, and staff and parents are told what is measured and how displays work. No personal data is collected. Every approval is kept with the school record. No crew goes to site before its approvals are in place. 9. From order to operation · Build Build and calibrate Sensors are calibrated, radios paired, the gateway and node configured with room names and enrolled with their identities. Each kit is labelled by room. Nothing ships until the whole kit has passed its tests together. Test results travel with the kit to the site. [Open the Station Builder](https://observatory.global/studio/builder/) 10. From order to operation · Install Install room by room Crews mount sensors at breathing height in every room, fit simple displays for teachers, install the gateway and node and connect to the school network. Every room is recorded. Crews follow the site safety plan throughout the work. The site record is updated before the crew leaves. 11. From order to operation · Commission Commission over a week Each node proves its identity. Readings are checked against a reference, ventilation performance is measured in each room through a normal week, and rooms that never clear are reported to facilities. Acceptance is recorded with the owner before handover. Results are signed and kept with the site record. 12. From order to operation · Operate Ventilate when needed Teachers see a simple signal to open windows or boost ventilation; facility teams see rooms that never clear and fix them; parents and inspectors see evidence of good air. Every alert and action is kept on the record. Reports for owners and funders come from the same record. 13. From order to operation · Maintain Keep sensors honest Sensors are checked against a reference on the agreed plan, batteries replaced when low, displays maintained and software updated in rings. Annual reports show the air in every room. Maintenance history stays with each site for its whole life. Spares and procedures travel with the crews. [Book field services](https://observatory.global/contact/field-service/) 14. Data products For teachers, facilities and parents Teachers receive room air signals; facility teams receive ventilation performance reports; parents, inspectors and authorities receive indoor air records; maintenance planners receive the rooms needing repair, each tied to room and time. Every product can be traced back to its readings. [See the data products](https://observatory.global/data-products/) 15. Evidence Standards for indoor air Indoor parameters follow the European indoor environment standard and the ventilation standard, carbon dioxide is used as an indicator as health guidance recommends, and particles are set against the air quality guidelines. Every reading is kept for each room. The record is kept for as long as the duty lasts. Drawn againstEN 16798-1 · ANSI/ASHRAE Standard 62.1 · Roadmap to improve and ensure good indoor ventilation · WHO global air quality guidelines 16. What you get Sensing 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. Delivered as managed service and data licence, for agencies, utilities, municipalities, insurers, agribusiness. Scale: Global, multi-site, per-site pricing. [Talk to sales](https://observatory.global/contact/sales-enquiry/) 17. Next step Plan classroom air and ventilation 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 classroom air and ventilation. 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 deployment](https://observatory.global/contact/deployment/) [Open the Station Builder](https://observatory.global/studio/builder/) [Open the Studio](https://observatory.global/studio/) **01** The place and its hazards ## Where it runs, and what can go wrong. Operating contextIndoor environmental parameters for ventilation, comfort and air quality are set in the European standard and in the ventilation standard used in many countries, and health guidance on indoor ventilation uses carbon dioxide as an indicator. Schools are judged by parents and inspectors on the air in their rooms. Hazards - Carbon dioxide building up in crowded rooms - Rooms too hot or too cold - Ventilation systems that do not work as designed - Outdoor pollution entering through open windows - No evidence when parents ask about air quality **02** What 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 | | --- | --- | --- | --- | | Carbon dioxide | Every classroom at breathing height | Every few minutes | 12 | | Temperature and humidity | Every classroom | Every few minutes | 13 | | Particles | Classrooms and outdoors at the school | Every few minutes | 4 | | Ventilation performance by room | From carbon dioxide decay after lessons | Daily, from each lesson | 32 | **03** The 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. 1. **01** Base unit A room sensor: carbon dioxide, temperature, humidity and particles on a low-power radio. [Build a station →](https://observatory.global/studio/builder/) 2. **02** Site A school: a sensor in every room, a gateway, a node and the school network. [Plan a site →](https://observatory.global/contact/deployment/) 3. **03** Fleet Every school of a district on one facilities view. [Managed offers →](https://observatory.global/industries/education/solutions/) 4. **04** Network Districts share indoor air records with health and education authorities. [The open protocol →](https://observatory.global/protocol/) - **01** Air quality monitor - **02** Compact weather station - **03** LPWAN endpoint - **04** LoRaWAN gateway - **05** Edge node (Wedge) Radio and links ### LoRaWAN Room sensors reach one gateway per school over a low-power link, with no cabling and years of battery life. Radio and links ### Wi-Fi The node joins the school network to reach facility teams and dashboards. Edge computeThe node shows each room's air as a simple signal for teachers, computes ventilation performance from carbon dioxide decay, flags rooms that never clear and links outdoor particles with when to keep windows shut. PowerRoom sensors run on batteries for years; the gateway and node run from school power. **04** How 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. Classroom air and ventilation: data path – of 08 01 Instruments Measurement with sensor identity andcalibration 02 Field radio 03 Gateway 04 Node – Wrap in an observation envelope with timequality– Measure quality and uncertainty, attachquality flags– Buffer locally (store-and-forward when thelink drops) 05 Backhaul Commit with transactional outbox andpublish, delivered at least once 06 Site Consumer inbox deduplicates and applieseach record once into governed data 07 Data store Governed product through API, map orexport, correction-aware 08 Products BACnetOGC SensorThings APIMQTT 01 Air quality monitor SDI-12 · RS-485 · Ethernet 02 Compact weather station SDI-12 · RS-485 · Ethernet 03 LPWAN endpoint Analogue I/O · SDI-12 · RS-485 04 LoRaWAN gateway Ethernet · RF · GNSS antenna 05 Edge node (Wedge) Ethernet · Fibre · USB · RS-485 ·BMC IP backhaul Not in the reference kit Site MQTT 5 with Sparkplug B Governed data store Versioned, correction-aware Room air signals Ventilation performance reports Indoor air records Rooms needing repair SDI-12 SDI-12 LoRaWAN Ethernet Ethernet IP From the instrument to the published product: each band is a tier, each connector names its interface, and the numbers match the bill of materials. Hover or focus a block to trace its path; scroll or step to follow one observation. | Item | Equipment | Data ports | Protocols | Power in | | --- | --- | --- | --- | --- | | 01 | **Air quality monitor** Particulate and gas monitor (PM, NO2, O3, CO, SO2) for outdoor or indoor air. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC | | 02 | **Compact weather station** All-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 | **LPWAN endpoint** Battery-powered endpoint on LoRaWAN, NB-IoT or LTE-M that carries one or more sensors. | Analogue I/OSDI-12RS-485 | LoRaWAN, OMA LwM2M, CoAP | Internal battery, Energy harvesting | | 04 | **LoRaWAN gateway** Multi-channel LoRaWAN gateway that forwards uplinks to a network server and schedules downlinks within duty limits. | EthernetRFGNSS antenna | LoRaWAN, MQTT 5 | PoE, 12 V DC | | 05 | **Edge node (Wedge)** Rugged edge node that boots from signed media, attests itself and establishes a site cell from little or no infrastructure. | EthernetFibreUSBRS-485BMC | MQTT 5, DMTF Redfish, IEEE 1588 PTP, NTP with NTS, OPC UA | 12 V DC, 24 V DC, 48 V DC, AC mains | 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 The smallest deployable unit is one node; the same unit is replicated to meet the demand. Nodes form a site, sites may form a cluster, sites and clusters are coordinated as a fleet, and fleets exchange across independently administered trust domains. Each plane is a separate channel with its own open binding. **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. **05** From 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. 1. 01 Order Scope with the facilities team The scope reads the district's schools, room counts, ventilation types and complaints. Nexus Observatory Inc. returns the sensor plan, displays for teachers, facility reports and a price per room and per year. The scope is agreed before any site work begins. 1 2. 02 Survey Survey rooms and systems Crews survey representative rooms with facility staff: sensor positions away from windows and doors, ventilation systems and their controls, gateway coverage and network access. Findings shape the kit for each site before anything is built. Every finding is kept with the site record for the crews who follow. 3 3. 03 Permits School approval The school and district approve installation, and staff and parents are told what is measured and how displays work. No personal data is collected. Every approval is kept with the school record. No crew goes to site before its approvals are in place. 4. 04 Build Build and calibrate Sensors are calibrated, radios paired, the gateway and node configured with room names and enrolled with their identities. Each kit is labelled by room. Nothing ships until the whole kit has passed its tests together. Test results travel with the kit to the site. 5. 05 Install Install room by room Crews mount sensors at breathing height in every room, fit simple displays for teachers, install the gateway and node and connect to the school network. Every room is recorded. Crews follow the site safety plan throughout the work. The site record is updated before the crew leaves. 6. 06 Commission Commission over a week Each node proves its identity. Readings are checked against a reference, ventilation performance is measured in each room through a normal week, and rooms that never clear are reported to facilities. Acceptance is recorded with the owner before handover. Results are signed and kept with the site record. 2 7. 07 Operate Ventilate when needed Teachers see a simple signal to open windows or boost ventilation; facility teams see rooms that never clear and fix them; parents and inspectors see evidence of good air. Every alert and action is kept on the record. Reports for owners and funders come from the same record. 12 8. 08 Maintain Keep sensors honest Sensors are checked against a reference on the agreed plan, batteries replaced when low, displays maintained and software updated in rings. Annual reports show the air in every room. Maintenance history stays with each site for its whole life. Spares and procedures travel with the crews. **06** Data products and integration ## What it delivers, to whom, and into which systems. Data products - **Room air signals** Teachers - **Ventilation performance reports** Facility teams - **Indoor air records** Parents, inspectors and authorities - **Rooms needing repair** Maintenance planners Integration - **Building management** Room readings can drive ventilation controls. - **Facility planning** Reports feed maintenance and investment plans. - **Parent communication** Summaries are shared through the school's channels. Exchanged through BACnet, OGC SensorThings API, MQTT. **07** Questions buyers ask ## Before you scope it. What do teachers have to do? Open windows or boost ventilation when the signal says so. Does it record people? No. It measures the air only. Can it control ventilation? Yes, through the building controls where they exist. How long do batteries last? Years, with alerts when low. **08** Resources ## The sources behind this page. Public standards, regulations and guidance, cited where they apply. Each applies only where its jurisdiction or scope does. 1. **1** [EN 16798-1: Energy performance of buildings, ventilation for buildings, indoor environmental input parameters](https://www.cencenelec.eu/) European Committee for Standardization 2. **2** [Roadmap to improve and ensure good indoor ventilation in the context of COVID-19](https://www.who.int/) World Health Organization · 2021 3. **3** [ANSI/ASHRAE Standard 62.1: Ventilation and Acceptable Indoor Air Quality](https://www.ashrae.org/) ASHRAE 4. **4** [WHO global air quality guidelines](https://www.who.int/) World Health Organization · 2021 **09** Related ## Use cases and solutions. [Use case Hybrid air-quality observatoryA few reference analysers and many low-cost nodes, with co-location calibration and an open-data feed.The full use case →](https://observatory.global/use-cases/hybrid-air-quality/) [Solution Sensing as a ServiceObservation 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 education →](https://observatory.global/industries/education/solutions/#sensing-service) [Solution Hybrid air-quality networksReference analysers plus calibrated low-cost nodes, with co-location calibration and an open-data interface.Solutions for education →](https://observatory.global/industries/education/solutions/#air-quality-networks) [Solution Environmental exposure monitoring for health programmesHeat, air and water exposure measurements around facilities and communities; no diagnosis or treatment.Solutions for education →](https://observatory.global/industries/education/solutions/#exposure-monitoring) **10** Education: specialized fields ## Other fields of this industry. [Specialized field School observatoriesWeather, air quality and seismic stations at schools that students run, with real data for lessons, shared with networks that can use them.The full field →](https://observatory.global/industries/education/school-observatories/) [Specialized field Technician training and qualificationTraining labs with real stations, calibration benches and network equipment, where technicians learn to install, calibrate and repair observing systems and earn recognised qualifications.The full field →](https://observatory.global/industries/education/technician-training/) [Specialized field Safe schoolsEarthquake, flood and heat sensing at schools, linked to warnings and drills, so schools protect students, stay open and recover quickly after hazards.The full field →](https://observatory.global/industries/education/school-safety/) ### Bring us the site. Plan a deployment, configure a station, model it in the Studio or talk to sales. 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