AirGradient Open Air

Quick verdict

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.

Last checked: 2026-03-22

Compatibility snapshot

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. Significantly more expensive than indoor air quality sensors
• 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 and cheaper
• 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.

Buying reality check

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.

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