AirGradient ONE
Built on completely open-source hardware, the AirGradient ONE integrates commercial-grade components—including a SenseAir S8 CO2 module and Sensirion PM2.5/NOx sensors—offering transparent data governance without subscription paywalls.
via Amazon.com
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- +Commercial-Grade SenseAir S8 NDIR CO2 Sensor
- +Dedicated NOx Gas Sensor Alongside VOCs
- +100% Open-Source Firmware, Hardware, and ESPHome Integration
- +Excellent Price-to-Performance Ratio
- −Requires Continuous USB-C Power (No Battery)
- −Industrial Design May Not Suit All Living Room Decors
The AirGradient ONE stands out as one of the best options for users who prioritize measurement accuracy, data transparency, and local control. It combines a SenseAir S8 NDIR CO2 sensor with a Sensirion SEN55 module to measure CO2, PM1.0, PM2.5, PM10, VOCs, and NOx, while also tracking temperature and humidity. Unlike many proprietary monitors, the ONE provides direct access to its data through REST APIs, MQTT, Home Assistant, and ESPHome, giving users significantly more flexibility in how measurements are stored and analyzed.
The device features a clear LED matrix display and an RGB light bar that provides an immediate visual indication of air quality. Data can be sent to the free AirGradient Cloud dashboard, but the device can also operate with local servers without requiring dependence on third-party cloud services. Its open design and extensive integration options make it particularly appealing to technically minded users, researchers, and smart home enthusiasts who want full control over their air quality data.
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James has reviewed consumer electronics and gadgets for over 6 years. He specializes in audio equipment, cameras, and smart home devices.
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AirGradient ONE – FAQs
Yes, for most buyers. The AirGradient ONE stands out for: Commercial-Grade SenseAir S8 NDIR CO2 Sensor and Dedicated NOx Gas Sensor Alongside VOCs. The main trade-offs are Requires Continuous USB-C Power (No Battery). Check our full Electronics and Gadgets comparison for alternatives.