Data from Amazon and official AirGradient site.
2026 verdict
Same sensor suite, different address: the AirGradient Open Air comes out ahead of the AirGradient ONE among these two air quality monitors, as the lower priced of the pair and the only one built to live outdoors.
Both read PM0.3 through PM10, CO2, TVOC, NOx, temperature and humidity, raise the same alerts, keep history and talk to Home Assistant alone. What the AirGradient ONE adds is a 1.3 inch OLED screen so the numbers show without a phone, in a larger 350 g indoor cabinet, whereas the AirGradient Open Air has weather resistance, no display and a lighter 180 g body. Neither measures carbon monoxide or radon. Choose the AirGradient ONE for a bedroom or office wall, and the AirGradient Open Air for a balcony, porch or garden where you want the outdoor reading.
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Winner
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| Feature | AirGradient ONE | AirGradient Open Air | Winner |
|---|---|---|---|
| Price | $230.00 | $190.00 | AirGradient Open Air |
| Weather Resistance | NO | YES (Outdoor) | AirGradient Open Air |
| Screen | YES | NO | AirGradient ONE |
| Warranty | 1 year | 1 year | Tie |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi, Bluetooth | Tie |
| Integrations | Home Assistant | Home Assistant | Tie |
| Sensors | TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity | TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity | Tie |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | Tie |
What the differences mean
Indoor or outdoor rating
The AirGradient Open Air is rated for outdoor use, while the AirGradient ONE has no weather resistance rating and is strictly indoors. Put the ONE outside and rain or dew will find it, so the choice follows where the reading has to come from.
Display
The AirGradient ONE has a 1.3 inch monochrome OLED at 128 x 64 pixels that shows the readings at a glance. The AirGradient Open Air has no screen, so everything is read in a phone app or a Home Assistant dashboard.
Sensors and alerts
There is no difference here: both measure PM0.3, PM1, PM2.5, PM10, CO2, TVOC, NOx, temperature and humidity, and both raise air quality, temperature and humidity alerts. Buying the outdoor unit gives up no measurement.
Size and weight
The AirGradient ONE is 130 x 130 x 35 mm at 350 g, a flat unit for a shelf or wall. The AirGradient Open Air is 91.5 x 86.7 x 85 mm at 180 g, small and light enough to mount on a post or bracket.
Power and platforms
Both run on USB-C with no battery, both use 2.4 GHz Wi-Fi with Bluetooth and both list Home Assistant only, with no Alexa, Google Home, HomeKit, SmartThings or Matter. Outdoors, the cable route is the real siting limit.
Which one to buy if
- you want to compare the air outside with the air inside
The AirGradient Open Air measures the same pollutants outdoors that the AirGradient ONE measures in the room.
- you want to read CO2 and PM2.5 on the device without opening an app
The AirGradient ONE shows its readings on a built-in OLED, while the Open Air has no screen.
- the monitor will sit on a covered porch or balcony
The AirGradient Open Air carries an outdoor weather resistance rating, and the AirGradient ONE has none.
- you need one monitor for a bedroom or home office
The AirGradient ONE is the indoor model, with a display and a flat shape made for a wall or shelf.
- + Screen: YES
- - Price: $230.00 vs $190.00
- - Weather Resistance: NO vs YES (Outdoor)
Winner
- + Price: $190.00
- + Weather Resistance: YES (Outdoor)
- - Screen: NO vs YES
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- AirGradient ONE
- AirGradient Open Air
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Frequently Asked Questions
Which is better overall: AirGradient ONE or AirGradient Open Air?
The AirGradient Open Air, by a narrow margin. It has the same sensors and alerts as the AirGradient ONE, is the lower priced of the two and adds outdoor weather resistance. The AirGradient ONE is better indoors because of its display.
What is the biggest difference between the AirGradient ONE and the AirGradient Open Air?
Placement. The AirGradient ONE is an indoor monitor with a built-in OLED screen, while the AirGradient Open Air is weather resistant, has no screen and is made for outdoor mounting.
Do the AirGradient ONE and the AirGradient Open Air measure the same things?
Yes. Both measure PM0.3, PM1, PM2.5, PM10, CO2, TVOC, NOx, temperature and humidity. Neither has a carbon monoxide or radon sensor, so neither replaces a CO alarm.
Do the AirGradient ONE and the AirGradient Open Air work with Alexa, Google Home or Apple Home?
No. Both the AirGradient ONE and the AirGradient Open Air list Home Assistant as their only smart home integration, with no Alexa, Google Home, Apple Home, SmartThings or Matter.
Who should buy the AirGradient ONE?
Home Assistant users who want a broad indoor air quality monitor with a screen for a bedroom, office or living room, and who accept USB-C power and a 1 year warranty.
Who should buy the AirGradient Open Air?
Home Assistant users who want to know whether outdoor air is better or worse than indoor air, for example before opening a window or during a smoky day, and who can run a USB-C cable outside.
Full comparison table
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