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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United StatesLevoit is the home environment brand of VeSync, covering air purifiers, humidifiers, tower fans and cordless vacuums. Its connected models run over Wi-Fi through the VeSync app, which handles auto mode, scheduling, live air quality readings and filter life tracking, and they work with Amazon Alexa and Google Home. Many of its purifiers carry AHAM Verifide and Energy Star certification, and the range is also reachable from Home Assistant through the VeSync integration.
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