AirGradient ONE Indoor Air Quality Monitor

The AirGradient ONE (Model I‑9PSL) is a professional‑grade indoor air quality monitor that measures PM1, PM2.5, PM10, CO₂, TVOCs, NOx, temperature, and humidity. With a built‑in LED status bar, onboard display, open‑source firmware, and native Home Assistant/Homey support, it delivers accurate, real‑time air quality insights for homes, offices, classrooms, and commercial spaces.

How It Works:

• [PM1 / PM2.5 / PM10 Monitoring]: Uses the Plantower PMS5003T laser sensor for precise particulate readings.
• [CO₂ Monitoring]: SenseAir S8 NDIR sensor detects CO₂ levels and identifies ventilation issues.
• [TVOC & NOx Monitoring]: Sensirion SGP41 provides advanced gas detection for chemicals, odours, and combustion by‑products.
• [Temperature & Humidity]: Built‑in sensors track comfort and environmental stability.
• [LED Status Bar]: Colour‑coded air quality indicator visible across the room.
• [Onboard Display]: Shows real‑time readings without needing an app.
• [Open‑Source Firmware]: Modify, extend, or integrate the device however you like.
• [Home Assistant & Homey Support]: Native integration for smart home automation.
• [Flexible Data Use]: Send data to any server, including AirGradient’s platform or your own.

A Top Pick For:

• [Smart Homes]: Native Home Assistant/Homey support + open‑source flexibility.
• [Schools & Offices]: CO₂ + PM monitoring helps optimise ventilation and safety.
• [Clinics & Healthcare]: High‑grade sensors for reliable indoor air tracking.
• [DIY & Makers]: Fully customisable hardware and firmware.
• [Commercial Deployments]: RESET‑accredited and compliant with building standards.

Why We Like It:

• [Professional‑Grade Sensors]: Same sensor families used in commercial IAQ systems.
• [Open‑Source Freedom]: No locked‑down ecosystem — modify anything.
• [Comprehensive Metrics]: Eight key indoor air quality parameters in one device.
• [RESET Accreditation]: Meets global building‑standard requirements.
• [Robust ASA Enclosure]: UV‑resistant, durable, and engineered for accurate airflow.

Care And Maintenance

• [Sensor Modules]: Keep vents clear for accurate airflow.
• [Enclosure]: Wipe with a soft cloth; ASA plastic resists UV and wear.
• [Mounting]: Use screws or stainless‑steel zip ties for secure installation.
• [Firmware]: Update or customise via AirGradient’s open‑source tools.
• [Data Management]: Export or stream readings to your preferred server.