Some car manuals say to roll down the windows to let out all the hot air before turning on A/C.
Many people are in their cars every day. In this hot weather, most people are unaware that it is cancerous to immediately turn on the A/C.
According to research, the car dashboard, seats, and air freshener emit Benzene, a Cancer causing toxin (carcinogen – take time to observe the smell of heated plastic in your car). Benzene also poisons bones, causes anemia, reduces and white blood cells. Prolonged exposure can cause leukemia, and miscarriages.
The acceptable Benzene level indoors is 50 mg per sq. ft. A car parked indoors with windows closed will contain 400-800 mg of Benzene. Car parked under the sun at temperatures above 60 degrees F will cause the Benzene level to go up to 2000-4000 mg, 40 times the acceptable level.
People who get into the car, keeping windows closed will inevitably inhale, in quick succession, excessive amounts of the toxin that affects their kidney and liver. This toxin is also extremely difficult for the body the expel.
Read more health hazard tips from snopes.com