The cause of the some air pollution is cars factories and other things that use gas and smoke that goes in the air and pollutes the air. The effect can kill many people and animals also plants. For the humans it can make air hard to breathe. Also the same for animals. It can stop photosynthesis for plants.
These steps as well as many others, are things we all can do to help reduce air pollution conserve energy remember to turn off lights, computers, and electric appliances when not in use. Participate in your local utility's energy conservation programs.