AirGradient
AirGradient ONE
$150
AirGradient ONE Overview
The AirGradient ONE is a premium CO2 monitor that tracks CO2, PM2.5, Temperature, Humidity, VOC and NOx. It uses a NDIR sensor — the technology we recommend for reliable CO2 readings — with a stated accuracy of ±50 ppm across a 400-5000 ppm measurement range. At $150, it is aimed at home use, offices, smart home setups and classrooms.
In day-to-day use, the ONE offers an onboard display, so you can read levels at a glance without opening an app, plus WiFi connectivity for logging trends and setting alerts, plus a stationary design (USB-C powered) best suited to continuous monitoring in a fixed location.
Best For
Full Specifications
| Price | $150 |
| Sensors | CO2, PM2.5, Temperature, Humidity, VOC, NOx |
| Sensor Type | NDIR |
| Connectivity | WiFi |
| Display | Yes |
| Portable | No |
| Battery Life | USB-C powered |
| CO2 Accuracy | ±50 ppm |
| CO2 Range | 400-5000 ppm |
Pros & Cons
Pros
- ✓True NDIR CO2 sensor (not an eCO2 estimate)
- ✓Multi-parameter monitoring: CO2, PM2.5, Temperature, Humidity, VOC, NOx
- ✓Built-in display for at-a-glance readings
- ✓WiFi connectivity for remote monitoring and history
Cons
- ✗Not designed for portable use
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Frequently Asked Questions
Is the AirGradient ONE accurate?+
The AirGradient ONE uses a NDIR sensor with a stated accuracy of ±50 ppm over a range of 400-5000 ppm. NDIR is the proven reference technology for consumer CO2 monitoring.
What does the AirGradient ONE measure?+
It measures CO2, PM2.5, Temperature, Humidity, VOC, NOx. CO2 is the key metric for judging ventilation — levels below 800 ppm indicate well-ventilated air.
Does the AirGradient ONE need WiFi?+
The AirGradient ONE supports WiFi for remote monitoring, but the onboard display works without any connection.
Is the AirGradient ONE worth it in 2026?+
At $150, the AirGradient ONE is a solid choice for home use, offices, smart home setups and classrooms. Its NDIR sensor puts it ahead of cheaper eCO2 estimators. Compare alternatives in our monitor comparison tool before buying.