What Else Makes the Air Dirty?
Particle pollution (say: par-tih-kul puh-loo-shun) also makes the air dirty. Particle pollution is created when tiny bits of dust, dirt, smoke, soot, chemicals from factories, and droplets from aerosol (say: ar-uh-sol) cans hang in the air we breathe. The smaller the particles, the deeper they can get into the lungs.