A unique product for a real need: local outdoor air quality monitoring. If you live in an area with wildfire smoke, industrial pollution, or heavy traffic, the Open Air gives you PM1, PM2.5, and PM10 data right in Home Assistant. It is weatherproofed for permanent outdoor mounting and runs on open-source ESPHome firmware. Not cheap, but there is nothing else quite like it for Home Assistant users who want to know what is in the air outside their home before opening windows or going for a run.
Standout: Open-source outdoor air quality monitor with PM particulate tracking and ESPHome integration.
Notes last checked Mar 22, 2026.
Compatibility snapshot
Home AssistantexcellentFull local control, no cloud needed. Native Home Assistant integration or a local protocol.
Apple HomenoneNo official support on this platform.
Google HomenoneNo official support on this platform.
AlexanoneNo official support on this platform.
Works offlineyes
Setupmoderate
Extra hub neededno
Powerusb
Local control facts
Home Assistant: airgradient integration, Local Polling, Platinum on the quality scale (home-assistant.io, checked Sep 10, 2026)
Why it stands out
purpose-built for outdoor use with weatherproof enclosure and outdoor-rated sensors
open-source and ESPHome-compatible for full firmware and data control
tracks PM1, PM2.5, and PM10 particulates, essential for wildfire smoke and pollution monitoring
Reasons to hesitate
premium pricing for a niche outdoor monitor
requires a power source outdoors, which may need weatherproof wiring
WiFi range to your outdoor mounting location must be reliable
Best for
Home Assistant users in areas affected by wildfire smoke or urban air pollution
open-source enthusiasts who want local outdoor environmental monitoring
Avoid if
you only need indoor air quality data. The AirGradient ONE is better suited for indoor use
you do not have a reliable outdoor power source or WiFi coverage
Privacy and local-control notes
Open-source hardware with ESPHome firmware. Fully local operation, no cloud account or external data sharing required.
Home Assistant support: supported · integration path: AirGradient / ESPHome.
Price notes: Premium pricing reflects the weatherproof design and outdoor-rated particulate sensors. A niche product, but nothing else quite matches it for local outdoor air quality monitoring.
CO2, PM2.5 and VOC with no cloud account: AirGradient ONE overall, Apollo AIR-1 for ESPHome, IKEA ALPSTUGA for the money. What each one actually measures.
Learn how to use Home Assistant locally to monitor humidity and temperature, spot mold-prone conditions, and set up alerts that keep your home healthy.
