Toxic air in your car

Someone sent me this warning. If there is some thruth in it please share your opinion with me. Thanks.

Open the windows while entering your car According to research done by a U.C.(?), the car dashboard, sofa and air freshener will emit Benzene, a cancer causing toxin (carcinogen). In addition, it poisons your bones, causes anemia, and reduces white blood cells. Prolonged exposure to it may cause Leukemia. May also cause miscarriage.

Acceptable Benezene level indoors is 50 mg per sq. ft. A car parked indoors with the windows closed will contain 400-800 mg of Benezene. If parked outdoors under the sun at a temperature above 60 degrees F, the Benezene 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 toxin. 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 difficult for your body to expel.