
Air quality
18 boardsKiCad boards from 13 GitHub repositories tagged “air-quality”, the most starred first; open any of them in PCBKit.
- 2 layers50 × 38 mm

- 2 layers89.2 × 103.5 mm

Oas
hubertciebiada/open-ambient-sensor
OAS — Open Ambient Sensor: DIY multi-sensor indoor environmental monitor (CO2, PM, VOC/NOx, temperature/humidity, mmWave presence) on ESP32-C6 with ESPHome / Home Assistant integration
64 parts44GPL-3.0 - 4 layers100 × 75 mm

OpenAirScope
emertcakir/OpenAirScope
Open-source air quality and environmental monitoring node with STM32H743 + ESP32-C3, LoRaWAN, RS485, USB-C, Li-ion charging, and multi-sensor support.
282 parts26MIT - 2 layers93 × 42 mm

ADEM
timelab/ADEM
Mobile device for distributed measurements of particulate matter (fine dust)
29 parts13LGPL-3.0 - 2 layers86 × 44.5 mm

Kiwi EasyBoardv1.2
SWAT-engineering/kiwi-air-monitor
Kiwi monitor is an open source CO2/Humidity/Temperature sensor intended for monitoring the quality of the air in a room. Kiwi was created to support teachers with a notification to ventilate their classroom.
21 parts10GPL-3.0 - 2 layers20.3 × 15.2 mm

- 2 layers49 × 67 mm

Airy
iharhl/airy
Air quality monitoring project based on ESP32C6 with BLE and Matter support + SwiftUI companion app
19 parts3Apache-2.0 - 2 layers87.2 × 69 mm

OhareV1
Will946/O-hareAir
An ESP32-based flower that measures air quality with real sensors and physically points a needle at how badly you need to open a window.
39 parts1MIT - 2 layers36 × 57 mm

Fug
bboe/fug
Carrier PCB joining a WEMOS D1 Mini (ESP8266) to a Sensirion SCD30 CO2/RH/T sensor. Script-generated KiCad.
13 partsCC-BY-SA-4.0 - 2 layers80 × 60 mm

Atmosmesh room
konih/atmosmesh
ESP32 indoor air-quality station: PM, climate, and a local OLED — headed for MQTT, Home Assistant, and Grafana.
44 partsMIT - 2 layers65 × 75 mm

Bench breathe
rwrife/bench-breathe
USB-powered ESP32-C3 workshop air-quality logger that tracks PM2.5 and VOC trends locally to help makers improve ventilation habits without cloud accounts.
59 partsMIT - 2 layers46 × 36 mm

Atmosensor kicad
ssnover/atmosensor
Custom software, firmware, and hardware for air quality monitoring
31 parts - 2 layers35 × 21.4 mm

Air Quality Sensor
Szymon423/Air-Quality-Sensor
Open-hardware indoor air quality monitor: ESP32-S3, SCD41 CO₂, SHT4x temp/humidity, SPA06 pressure, WS2812 LED ring. Round PCB in KiCad, 3D-printed enclosure.
114 parts - 2 layers50 × 38 mm

- 2 layers29 × 40 mm

ESP8266-12 breakout
timelab/ADEM
Mobile device for distributed measurements of particulate matter (fine dust)
19 parts13LGPL-3.0 - 2 layers115.6 × 50.8 mm

Kiwi EasyBoardv1.0
SWAT-engineering/kiwi-air-monitor
Kiwi monitor is an open source CO2/Humidity/Temperature sensor intended for monitoring the quality of the air in a room. Kiwi was created to support teachers with a notification to ventilate their classroom.
20 parts10GPL-3.0 - 2 layers89.8 × 44.5 mm

Kiwi EasyBoardv1.1
SWAT-engineering/kiwi-air-monitor
Kiwi monitor is an open source CO2/Humidity/Temperature sensor intended for monitoring the quality of the air in a room. Kiwi was created to support teachers with a notification to ventilate their classroom.
19 parts10GPL-3.0 - 2 layers139 × 58 mm

Atmosmesh bench
konih/atmosmesh
ESP32 indoor air-quality station: PM, climate, and a local OLED — headed for MQTT, Home Assistant, and Grafana.
29 partsMIT