BME680

The BME680 adds a gas-sensitive element (volatile organic compounds) to the BME280BHardwareBME280Temperature, humidity and barometric pressure sensorView profile trio, which combined with Bosch's BSEC library yields an air-quality index (IAQ). It keeps the tiny footprint and low power.

Note: the gas sensor measures resistance, not absolute concentrations of a specific gas; it gives 'good/bad air' trends, not CO₂ ppm (for that, the SCD41SHardwareSCD41CO₂, temperature and humidity sensorView profile). It's the pick for all-in-one environmental stations.