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Air Quality Monitors · Head to head

AirGradient ONE vs IQAir AirVisual Outdoor

Full Smart Air Quality Monitors comparison in 2026

Updated September 2026
Data from Amazon and official AirGradient and IQAir sites.
2026 verdict
One is built for the living room, the other for the fence post, and the AirGradient ONE is the better monitor of the two on what it senses and what it costs.
AirGradient ONE
Winner
AirGradient ONE
$230.00
Buy on Official StoreCheck price
It reads PM0.3, PM1, PM2.5, PM10, CO2, TVOC and NOx plus temperature and humidity, shows them on an OLED screen and lists Home Assistant support. The IQAir AirVisual Outdoor is the one to mount outside: it is weather resistant, has Ethernet with Wi-Fi, adds atmospheric pressure and is aimed at particulates such as wildfire smoke, with no screen and no listed TVOC or NOx. Pick the AirGradient ONE for a bedroom or office wall, and the IQAir AirVisual Outdoor to watch the air outside the house from a wall or fence.
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FeatureAirGradient ONEIQAir AirVisual OutdoorWinner
Price$230.00$299.99AirGradient ONE
Weather ResistanceNOYES (Outdoor)IQAir AirVisual Outdoor
ScreenYESNOAirGradient ONE
SensorsTVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, HumidityPM1, PM2.5, PM10, CO2, Temperature, Humidity, Atmospheric PressureAirGradient ONE
AlertsTemperature Alerts, Humidity Alerts, Air Quality AlertsAir Quality AlertsAirGradient ONE
Warranty1 year1 yearTie
Connectivity2.4 GHz WiFi, Bluetooth2.4 GHz WiFi, EthernetTie
IntegrationsHome AssistantNoneTie

What the differences mean

Indoor or outdoor

The IQAir AirVisual Outdoor is rated for the weather and made to sit on an exterior wall. The AirGradient ONE has no weather resistance rating and belongs inside, so the two rarely compete for the same spot.

Pollutants covered

The AirGradient ONE covers PM0.3, PM1, PM2.5, PM10, CO2, TVOC and NOx. The IQAir AirVisual Outdoor lists PM1, PM2.5, PM10, CO2 and atmospheric pressure but no TVOC or NOx, which matters less outdoors than in a cooking-heavy kitchen.

Screen and alerts

The AirGradient ONE has a 1.3 inch OLED and raises air quality, temperature and humidity alerts. The IQAir AirVisual Outdoor has no screen and lists air quality alerts only, read through its app and dashboard.

Connection and power

The IQAir AirVisual Outdoor offers 2.4 GHz Wi-Fi and Ethernet, with wired power, so it can run on Power over Ethernet. The AirGradient ONE has Wi-Fi and Bluetooth only, powered over USB-C.

Smart home platforms

The AirGradient ONE lists Home Assistant. The IQAir AirVisual Outdoor lists no integration and leaves Home Assistant unconfirmed, so it is an app and dashboard product first.

Which one to buy if

What owners say

IQAir AirVisual Outdoor owners praise a well-built, German-made unit that goes up quickly over Power over Ethernet or Wi-Fi, with accuracy they trust for catching wildfire smoke and a neighbour's wood burning in real time and a web dashboard that charts down to the minute. The complaints are about data: access to their own readings is gated behind IQAir's indoor unit, public sharing or a membership, some see cleaner values on the public site than in the app, and they find the optional CO2 module expensive. Owners also describe unhelpful support after the first contact, and a few units that stopped working within a month. They note there is no smart home integration at all.

Frequently Asked Questions

Which is better overall: AirGradient ONE or IQAir AirVisual Outdoor?

The AirGradient ONE, indoors: it senses more pollutants, has a screen and lists Home Assistant. The IQAir AirVisual Outdoor is the one to pick if the monitor has to live outside.

What is the biggest difference between the AirGradient ONE and the IQAir AirVisual Outdoor?

Where they belong. The AirGradient ONE is an indoor monitor with an OLED and a broad sensor set, while the IQAir AirVisual Outdoor is a weather resistant, screenless outdoor monitor with Ethernet.

Can the AirGradient ONE be used outdoors like the IQAir AirVisual Outdoor?

It has no weather resistance rating, so it is meant for indoors. The IQAir AirVisual Outdoor is rated for outdoor mounting.

Does the IQAir AirVisual Outdoor work with Home Assistant like the AirGradient ONE?

The AirGradient ONE lists Home Assistant support. The IQAir AirVisual Outdoor lists none, and its owners describe using the IQAir app and dashboard instead.

Who should buy the AirGradient ONE?

Home Assistant users who want a broad indoor monitor of particles, CO2, TVOC and NOx with a display, and can live with USB-C power and a 1 year warranty.

Who should buy the IQAir AirVisual Outdoor?

Owners who want to track smoke and particulate levels outside their home from a wall-mounted unit over Ethernet or Wi-Fi, and are comfortable using IQAir's own app and dashboard.

Full comparison table

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