Outdoor burning can harm health, the environment, and property: Burning pollutes the air, causing serious health problems. The smoke from burning leaves, grass, brush, and tree needles can cause asthma, emphysema, bronchitis, and lung cancer. Children, the elderly, and those with breathing problems are most harmed by poor air quality. Burning also pollutes our water and soil. Smoke particles fall into our water and on our soil. Backyard fires can destroy property. Backyard fires that get out of control set off most of the wildfires caused by people. You can be held responsible for the cost of putting out your out-of-control fire, which can be very expensive.