BME680 is a digital sensor that measures temperature, gas, humidity, pressure, and altitude. It uses the I2C interface on the RPi.
First enable I2C.
The BME680 requires a burn-in period to collect accurate readings.
The burn-in information was found here;
The following graph represents the gas reading while the sensor is undergoing burn-in. Data was collected for all sensors every 5 seconds for twenty minutes.
Only the raw gas values are shown here;
The graph above represents the first burn-in data for the BME680 in a clean jar.
Data for a second burn-in was also collected.