The NO2 toxic danger inside our cars
At higher temperatures it is a reddish-brown gas
 Nitrogen dioxide is a chemical compound with the formula NO2. It is one of several nitrogen oxides. NO2 is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year for use primarily in the production of fertilizers. At higher temperatures it is a reddish-brown gas. It can be fatal if inhaled in large quantity. Nitrogen dioxide is a paramagnetic, bent molecule with C2v point group symmetry.

It is included in the NOx family of atmospheric pollutants.
Nitrogen dioxide is a reddish-brown gas above 21.2 °C (70.2 °F; 294.3 K) with a pungent, acrid odor, becomes a yellowish-brown liquid below 21.2 °C (70.2 °F; 294.3 K), and converts to the colorless dinitrogen tetroxide (N2O4) below −11.2 °C (11.8 °F; 261.9 K).

Pollution inside a car can be worse than on the pavement - It acts as a gas chamber, trapping nitrogen dioxide (NO2) and soot-like particles. Especially when you're stuck behind the exhaust of the car in front.

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Tackling the toxic danger inside our cars - BBC News
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