Which of the following air pollutants causes a reddish-brown haze in the sky?
sulfur dioxide
carbon monoxide
nitrogen dioxide
carbon dioxide

The correct answer is nitrogen dioxide. Carbon dioxide and carbon monoxied are invisible to the naked eye but are poisonous. That's why it's dangerous to drive if the exhaustion is bad in a car because you can get poisoned by them. Sulfur dioxide can be used and has historically been used for things like vine preservation, even though it is essentially toxic.

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels