The CCS811 module is a digital gas sensor with metal oxide (MOX) gas sensor to measure "Volatile Organic Compounds" (VOCs) from the air.
This sensor is intended for indoor use in combination with a microcontroller via an I2C interface. The sensor can also measure " equivalent CO2" (eCO2).

Specifications:

• Voltage: 1.8 - 3.3V DC (3.3V recommended)
• Current (continuous in mode 1): 30mA
• Power (sleep mode): 19hA (at 1.8V)
• Current (peak): 54mA
• Temperature range (operation): -40°C to +85°C
• Humidity range (operation): 10 - 95%