Best Air Quality

The Apollo Automation AIR-1 is a compact indoor air quality monitor built by a small US company specifically for the Home Assistant community. It ships running ESPHome, the open-source firmware platform, and measures the pollutants that actually matter indoors: particulate matter across several size bins, volatile organic compounds, temperature, and humidity from its core Sensirion sensor module, with optional add-ons including a dedicated CO2 sensor for configurations that include it. Plug it into USB-C power, add it to your Wi-Fi, and it appears in Home Assistant over the local ESPHome API with no app, no account, and no cloud anywhere in the loop.