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You can read more of it on: https://learn.adafruit.com
The BME680 takes those sensors to the next step in that it contains a small MOX sensor. The heated metal oxide changes resistance based on the volatile organic compounds (VOC) in the air, so it can be used to detect gasses & alcohols such as Ethanol, Alcohol and Carbon Monoxide and perform air quality measurements. Note it will give you one resistance value, with overall VOC content, it cannot differentiate gasses or alcohols.
What a cool sensor. Air quality - measured in ohms! Maybe in the next version they can tell us the humidity in lux, and the temperature in ounces?