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 StatesHoneywell Home is the residential comfort and security brand operated by Resideo under licence from Honeywell, covering smart thermostats, water and leak detection, security panels and air quality products. Its thermostat range spans the entry-level T5 up to the T9 and T10 Pro, which pair with wireless Smart Room Sensors so the system heats and cools the rooms people are actually in. The devices are managed through the Resideo app and work with Amazon Alexa, Google Assistant and Apple HomeKit depending on the model.
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