How do you measure air pollution from your car?

The car is the major source of particulate matter, but car emissions have also been linked to respiratory diseases.

Some of the pollutants in air pollution are known to affect the immune system and cause allergies.

Carbon monoxide is the main cause of heart attacks and strokes in people, but the health risks can be reduced by wearing a mask.

Some experts suggest that some people can reduce their risk by wearing masks that are made of plastic, which is less likely to leak.