Irritation: It's a good idea to open your car's window when you turn on your heater/ac as it allows potentially irritating substances in the car to dissipate out the windows before you start inhaling them. Some of these compounds include potential carcinogenic hydrocarbons as well as other particles. Infectious agents have been found in a/c units but it is the germs in the car itself that cause colds, etc.
Answered 5/30/2019
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