I enjoyed reading your article. And the picture is also beautiful. An important element of environment is air. Without clean air, it is impossible for any organism to survive on earth. But there is no longer a healthy life in a healthy environment. Polluted air has become dangerous for our life. Air can be polluted due to various reasons. But smoke is the main cause of air pollution. Carbon dioxide, chlorofluorocarbons, methane, nitrous oxides released from factory smoke, brick kiln smoke, vehicle exhaust etc. pollute the air. Besides, carbon dioxide, sulfur dioxide and nitrogen oxides are threatening to the environment. These gases form acids with water vapor and pollute the air. This acid falls to the surface with rain.