Air pollution is the contamination of the air by harmful chemicals, physical particles, or biological agents. It can occur indoors or outdoors and can be caused by a variety of sources, including: Motor vehicles, Household combustion devices, Industrial facilities, Forest fires, and Mining activities. 

Air pollution can have a number of negative consequences, including:

Health: Air pollution can cause a range of health problems, including strokes, heart disease, lung cancer, and respiratory diseases. Inhaling air pollutants can increase the risk of health problems, especially for children, older adults, and people with heart or lung disease. 

Climate: Air pollution can contribute to climate change. For example, methane, a volatile organic compound (VOC), is an efficient greenhouse gas that contributes to global warming. 

Economy: Air pollution can damage the economy by reducing workforce productivity. 

Some ways to reduce air pollution include: Taking public transportation or riding a bike instead of driving, Taking fewer airplanes, Turning off lights when not in use, and Eating less meat. 

Some countries have implemented programs to reduce air pollution, such as cap and trade, which limits the amount of pollution a company can emit.