ThailandAirGradient 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.
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ChinaQingping Technology is a Beijing company that builds indoor environmental sensors, and one of the better known hardware partners in the Xiaomi ecosystem. Its range covers air quality monitors that measure PM2.5, PM10, CO2, temperature and humidity, plus thermometer-hygrometers, motion and light sensors and a Bluetooth gateway. Devices pair with the Qingping+ app and, depending on model, with Apple HomeKit, Amazon Alexa, Google Home and Mi Home.
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