AirGradient Open Air

AirGradient Open Air

Model: O-1PST

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Our review

AirGradient Open Air Review: An Outdoor Air Quality Monitor That Feeds Home Assistant

Weather-resistant particulate, CO2, TVOC and NOx sensing for the garden or balcony, with Home Assistant as its only integration.

The verdict

The AirGradient Open Air is the outdoor half of an air quality setup: a weather-resistant, USB-C powered monitor that tracks PM0.3 through PM10 particulates, CO2, TVOC, NOx, temperature and humidity, and reports them to Home Assistant. There is no screen, so it is meant to be mounted outside and read on your phone or dashboard, and Home Assistant is the only supported platform. If you want to know whether the air outside is worse than the air inside, and you already run Home Assistant, this is the piece that gives you the outdoor side of that comparison.

Best for
  • Home Assistant users
  • Outdoor and balcony monitoring
  • Indoor versus outdoor comparisons
  • Wildfire smoke and traffic pollution tracking

Pros

  • Weather resistant for outdoor mounting
  • Broad sensor suite: PM0.3, PM1, PM2.5, PM10, CO2, TVOC and NOx
  • Temperature and humidity included
  • Native Home Assistant integration
  • Air quality, temperature and humidity alerts
  • History records and automation support
  • Light at 180 g, so mounting is simple

Cons

  • Home Assistant only: no Alexa, Google Home, HomeKit, SmartThings or Matter
  • No display on the unit
  • Wired USB-C power with no battery option, which limits where it can go outdoors
  • No carbon monoxide or radon sensor
  • One year warranty

Who is the AirGradient Open Air for?

This one is for the person who already tracks indoor air and wants the outdoor baseline to compare it against, or who lives near traffic, agriculture or wildfire risk and wants to know when to keep the windows shut. It is weather resistant and built to be mounted outside, powered over USB-C, and it reports into Home Assistant. It is not a standalone gadget: with no screen on the unit, everything you get from it arrives through your smart home dashboard.

What the Open Air measures

It carries the same broad sensor set as an indoor monitor, applied outdoors. Particulates are reported at PM0.3, PM1, PM2.5 and PM10, which is the range that matters for smoke, exhaust, dust and pollen, from the ultrafine particles that reach the bloodstream to the coarser ones that irritate the nose and throat. It also reads CO2, TVOC for the aggregate of volatile organic compounds, and NOx for the nitrogen oxides that come off vehicle emissions and industrial processes, which is exactly the pollutant to watch if you live near a highway. Temperature and humidity complete the picture, and air quality, temperature and humidity alerts can all fire when readings cross your thresholds.

What to know before you buy

Home Assistant is the only integration: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, IFTTT and Matter are all unsupported, so this only makes sense inside a Home Assistant setup. There is no display on the device, so there is no glance-at-it readout. Power is wired USB-C with no battery option, which is the real siting constraint outdoors: the mounting spot has to be within reach of a cable and a weather-safe power source. On sensors, there is no carbon monoxide and no radon measurement. Warranty coverage is one year.

Is the AirGradient Open Air worth it?

Its value depends entirely on whether you will use the data. Paired with an indoor monitor it answers a question no single device can: is opening the window going to help or hurt right now. With history records and automations supported, that outdoor reading can drive a purifier, a ventilation decision or just an alert on a smoky day. If you are not on Home Assistant, or you wanted a device that speaks to a voice assistant, this is the wrong monitor at this price.

Frequently asked questions

Can the AirGradient Open Air be installed outdoors?

Yes. It is weather resistant and designed for outdoor use, unlike AirGradient's indoor ONE model.

Does the AirGradient Open Air work with Alexa, Google Home or Apple HomeKit?

No. Home Assistant is the only supported platform. Google Home, Alexa, Apple HomeKit, Samsung SmartThings, IFTTT and Matter are all unsupported.

Does the Open Air have a screen?

No. There is no display on the device, so readings are viewed in Home Assistant rather than on the unit itself.

How is the AirGradient Open Air powered?

Over USB-C. There is no battery option, so it needs a cable run to a power source at the mounting location.

What pollutants does it track?

Particulate matter at PM0.3, PM1, PM2.5 and PM10, plus CO2, TVOC, NOx, temperature and humidity. It does not measure carbon monoxide or radon.

At a glance

Summary

Everything this air quality monitor supports, grouped by category.

Size & Materials
Weather Resistance3.6 × 3.4 × 3.3 in (91.5 × 86.7 × 85 mm)6.3 oz (180 g)
Power
Wired (USB-C)
Connectivity
2.4 GHz WiFiBluetooth
Integrations
Home Assistant
Sensors
TVOCPM0.3PM1PM2.5PM10CO2NOxTemperatureHumidity
Alerts
Temperature AlertsHumidity AlertsAir Quality Alerts
Features
History Records

Price History

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Company
AirGradient logo

AirGradient

Thailand flagHeadquartered in Thailand

AirGradient builds open-source indoor and outdoor air quality monitors that track PM2.5, CO2, temperature, humidity and other pollutants. The company is known for its open hardware and firmware, letting users build, repair and integrate the monitors with platforms like Home Assistant and its own dashboard. AirGradient appeals to people who want transparent, data-driven air quality monitoring rather than a closed black box.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Size & Materials
Weather Resistance

YES (Outdoor)

Dimensions

3.6 × 3.4 × 3.3 in (91.5 × 86.7 × 85 mm)

Weight

6.3 oz (180 g)

Power
Wired

USB-C

Battery Type

-

Battery Life

-

Connectivity
2.4 GHz WiFi

YES

2.4GHz IEEE 802.11 b/g/n-compliant

5 GHz WiFi

NO

Ethernet

NO

Bluetooth

YES

Z-Wave

NO

Zigbee

NO

Thread Protocol

NO

Other

NO

Display
Screen

NO

Screen Type

-

Color Screen

-

Touch Screen

-

Screen Size

-

Screen Resolution

-

Integrations
Google Home

NO

Alexa

NO

Apple HomeKit

NO

Samsung SmartThings

NO

Home Assistant

YES

IFTTT

NO

Matter

NO

Sensors
TVOC

YES

PM0.1

NO

PM0.3

YES

PM1

YES

PM2.5

YES

PM10

YES

CO

NO

CO2

YES

NOx

YES

Radon

NO

Temperature

YES

Humidity

YES

Atmospheric Pressure

NO

Ambient Light

NO

UV

NO

Occupancy

NO

Ambient Noise

NO

Alerts
Temperature Alerts

YES

Humidity Alerts

YES

Air Quality Alerts

YES

Low Battery Alerts

-

Features
Automations

YES

History Records

YES

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