A group of German scientists tested indoor air of motor vehicles for emissions of volatile organic compounds in heat – “parked sunshine” conditions. When the interiors were exposed to 14000 W of light, a total of 10.9 and 1.2 mg/m3 of volatile organic compounds were found in the indoor air of new and used motor vehicles respectively. The major compounds in the new vehicle were o,m,p-xylenes, C3 and C4-alkylbenzenes, dodecane, tridecane, and methylpyrrolidinone, while the used vehicle air contained acetone, methylpyrrolidinone, methylcyclohexane, acetaldehyde, o,m,p-xylenes, ethylhexanol, and toluene. More importantly, no toxicity was observed and these had no apparent health risks, including Benzene. Also note that this has got nothing to do with the AC that you are using in your car.
However, when in doubt, it is better to ventilate your car before you enter your car and turn on your AC just to feel good and get some fresh air.
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