You should not turn on A/C immediately as soon as you enter the car.
According to a research done, the car dashboard, sofa, air freshener emits Benzene, a Cancer causing toxin (carcinogen - take note of the heated plastic Smell in your car).
In addition to causing cancer, it poisons your bones, causes anemia,and reduces white blood cells. Prolonged exposure will cause
Leukemia,increasing the risk of cancer. May also cause miscarriage. Acceptable Benzene level indoors is 50 mg per sq. ft.. A car parked
indoors with the windows closed will contain 400-800 mg of Benzene. If parked outdoors under the sun at a temperature above 60 degrees F, the
Benzene level goes up to 2000-4000 mg, 40 times the acceptable level & the people inside the car will inevitably inhale an excess amount of the toxins.
Here is what your should do
1. Open the door and wait for some time then open the windows after you enter your car - It is recommended that you open the windows and door to give time for
the interior to air out before you enter. Benzene is a toxin that affects your kidney and liver, and is very
difficult for your body to expel this toxic stuff.
2. Turn ON the air-conditioning after windows are open for a few minutes.