Using cars is one way people change the air. The addition of such substances to the air is air pollution. Your environment is everything around you. In order to live you use things from your environment. Some of the most important things you use are air, water, and land. As people use things from their environment they change the environment. For example people use clean water for such things as bathing and washing dishes. When people use water they add things to it. Dirt soap detergent and food scraps are some things that may be added. This is pollution