Changes in CO2 concentrations are played by a trombone and a clarinet. The total Volatile Organic Compounds (tVOC) concentrations are played by a flute. The tVOC also changes the pitches on a guitar. Changes in either CO2 or tVOC's cause the guitar to play a sequence of notes. Raw data and plain wav audio files are listed here. The CO2 abd tVOC measurements are qualitative and are not calibrated. The relative changes in air quality are accurate and absolute concentrations are approximate.