To get the oxygen from air, lungs have a lot of work. They must filter tiny particles from the air. They must be free of irritation so you can breathe easily. But when air is polluted, all kinds of trouble can happen. Too many particles can escape the natural filter system in the lungs.
Hazardous chemicals can hurt the delicate lung tissues, making it harder to breathe.
The air can be polluted outdoors, or it can be polluted indoors. Anytime that air is polluted, it interferes with the work that your lungs do. When kids breathe polluted air every day, their lungs become damaged, unable to do the work of getting enough oxygen to the blood. Simple breathing becomes difficult or painful. After learning about air pollution, you can enter a contest with a poster that you can make.