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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SwedenBlueair is a Swedish air care company founded in 1996 and part of Unilever since 2016, specialising in air purifiers for homes, offices and cars. Its HEPASilent technology combines electrostatic and mechanical filtration to reach high clean air delivery rates at low noise, and its connected models report PM1, PM2.5 and PM10 through the Blueair app with Amazon Alexa and Google Home support. Most of its purifiers are AHAM Verifide and Energy Star certified.
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