The CCS811 Air Quality Breakout is a digital gas sensor solution that senses a wide range of Total Volatile Organic Compounds (TVOCs), including equivalent carbon dioxide (eCO2) and metal oxide (MOX) levels. [VOCs](https://en.wikipedia.org/wiki/Volatile_organic_compound) are often categorized as pollutants and/or sensory irritants and can come from a variety of sources like construction materials (paint, carpet, etc.), machines (copiers, processors, etc.) and even people (breathing, smoking, etc.). This breakout is intended for indoor air quality monitoring in personal devices such as watches and phones, but we’ve put it on a breakout board so you can use it as a regular I2C device. The onboard CCS811 supports multiple measurement modes that have been optimized for low-power consumption during an active sensor measurement and idle mode extending battery life in portable applications. We have broken out each necessary pin on the CCS811 as well as additional pins to add your own [NTC Thermistor](https://www.sparkfun.com/products/250) to determine the temperature of the CCS811’s surroundings, which can be used to help compensate the readings. **Note:** Please be aware that the CCS811 datasheet recommends a burn-in of 48 hours and a run-in of 20 minutes (you must allow 20 minutes for the sensor to warm up and output valid data). **Note:** Temperature compensation from an attached NTC Thermistor is no longer supported on the CCS811. In order to add environmental compensation to the CCS811 an external environmental sensor like the [SparkFun Atmospheric Sensor Breakout -BME280](https://www.sparkfun.com/products/13676?_ga=2.28700474.782469888.1586183076-1181388692.1584542699). If you are looking for a board that has this envirnomental compensation built in, check out the [SparkFun Environmental Combo Breakout - CCS811/BME280 (Qwiic)](https://www.sparkfun.com/products/14348?_ga=2.28700474.782469888.1586183076-1181388692.1584542699). *** Need a custom board? This component can be found in SparkFun\'s À La Carte board builder. You can have a custom design fabricated with this component - and your choice of hundreds of other sensors, actuators and wireless devices - delivered to you in just a few weeks. *** ->