Humans have wreaked havoc on the environment, and one of the worst types of pollution is air pollution. There are a variety of factors that contribute to air pollution. Vehicle traffic is one reason so does factory smoke; the combustion of fossil fuels, such as tar, produces poisonous smoke. These human-caused factors lead to air contamination. People receive what they did, and it even affects other people: elevated levels of air pollution cause respiratory and heart complications and other aspects of the human body. Some illnesses, such as cancer, are also caused by it. Every year, millions of people die as a result of air pollution around the world. We must stop this pollution together, as soon as possible.