Air Quality Monitoring
| Air Quality Monitoring | |
|---|---|
 | |
| Primary Contact | Asj |
| Created | 01/01/2026 |
| Status | Active |
| Type | Hackspace Infrastructure |
The air quality monitoring was funded via the Air Quality Monitoring Pledge Drive. All monitors report CO2 and VOC index. In a few places the monitors also have PMSA003 sensors for PM1.0, PM2.5, PM10.0. These measurements are published to MQTT on the topic nh/air, where they are then ingested into Prometheus for visualisation via Grafana (using a Node-RED flow).
Current Status
The boards are gradually being built. Steve designed an enclosure for them.
| Location | Measurements | Status |
|---|---|---|
| Comfy Area | VOC, CO2 |  Done
|
| Studio | VOC, CO2 | Done
|
| Craft Room | VOC, CO2 | Done
|
| Workshop | VOC, CO2, Particle | Built |
| Dusty | VOC, CO2, Particle | Done
|
| Metalworking | VOC, CO2 | |
| Electronics / 3D Printing | VOC, CO2, Particle | Built |
| Blue Room | VOC, CO2 | Built |
| Art Room | VOC, CO2 |
Hardware Description
The board is based around an Atmega 328p and WizNet W5500 Ethernet controller. There's a small buck supply to make powering the board more flexible. The VOC sensor used is a SGP40, and CO2 is reported with a SCD41. For boards which also measure air particles, they have a PMSA003 onboard. Out of curiosity and to help debugging, each board also has a INA219A chip and 0.1 ohm shunt. This allows the board to monitor its own power consumption.
The PMSA003 can be added or removed if desired. The firmware will only publish PM values if the sensor is detected. We may want to add this to certain areas (e.g. Metalworking Downstairs) at some point.