# AirGradient ONE

*AirGradient / I-9PSL*

> The AirGradient ONE is an open-source indoor monitor for PM2.5, CO2, TVOC, NOx, temperature and humidity that connects over Wi-Fi and is auto-discovered by Home Assistant. It suits Home Assistant users through an integration (local Wi-Fi control).

- Canonical page: https://smarthomecanon.com/devices/airgradient-one
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | AirGradient |
| Category | Air quality sensor |
| Model numbers | I-9PSL |
| Status | Current[^1][^2] |
| Type | Indoor air quality monitor[^1] |
| Measures | PM2.5, CO2, TVOC, NOx, temperature, humidity[^1] |
| Connection | Wi-Fi (2.4 GHz), Bluetooth LE[^1] |
| Power | USB-C, 5 V; power plug not included[^1] |
| Released | unknown |
| Model number | I-9PSL[^1] |
| Display | 1.3 inch OLED and 11 RGB LEDs[^1] |
| Dimensions | 130 x 130 x 35 mm[^1] |
| Weight | 350 g[^1] |
| Variants | Fully assembled ($230), kit ($138, no warranty or certification) and a cellular model I-9PSL-CE[^1] |
| Warranty | 12 months on the fully assembled monitor[^1] |
| ESPHome | withheld |

## Integration paths

**How the AirGradient ONE connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Wi-Fi local](https://smarthomecanon.com/protocols/wifi-local) | 2.4 GHz Wi-Fi network[^1] | withheld | unknown |

**Platform support for the AirGradient ONE**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Wi-Fi local | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | airgradient |
| Wi-Fi local | [Homey](https://smarthomecanon.com/platforms/homey) | Via integration[^3] |  |

## Related pages

- [AirGradient air quality monitors](https://smarthomecanon.com/lines/airgradient-air-quality-monitors) (line)
- [Wi-Fi with local control](https://smarthomecanon.com/protocols/wifi-local) (protocol)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)

## Sources

[^1]: AirGradient ONE indoor monitor. https://www.airgradient.com/indoor/ (manufacturer, checked 2026-10-20)
[^2]: AirGradient store: ONE I-9PSL fully assembled. https://store72735574.company.site/products/AirGradient-ONE-Indoor-Monitor-I-9PSL-Fully-Assembled-%26-Tested-p594725504 (manufacturer, checked 2026-10-20)
[^3]: AirGradient with Homey. https://www.airgradient.com/homey/ (manufacturer, checked 2026-10-20)