Air pollution occurs when the air contains gases, dusts, fumes in harmful amount. It is one of the most serious types of pollution. There are some causes that people make the air polluted. They use too much fossil fuel. They spray pesticides when doing farming and factories produce much smoke. Air pollution can have dramatic effects. It damages humans and animals' heath as well as food crop. It keeps breathing problems and lung cancer increasing. It also causes the global warming and acid rain. Because of these bad effects, we should reduce air pollution by using less fossil fuel, cutting down the amount of pesticides for farming and smoke from factories.   

Environmental pollution is an environmental phenomenon changed. Accordingly, the physical, biological, and chemical factors of the environment are changed. This change affects the health of humans as well as other organisms. Air pollution has two main causes: natural and man-made.

Natural causes can be mentioned as forest fires, dust winds, storms, ... However, most of the causes of air pollution are human:
- Production activities of the company, emissions are not handled properly.
-The process of burning fossil fuels during production. This is also one of the causes of air pollution.
Manufacturing industries often cause air pollution. May be mentioned are the metallurgy, thermal power plants, fertilizers, chemicals, textiles, footwear, ...
- Vehicles produce pollutant particles in the air. Air pollution causes profound effects on animals and plants. Dangerous compounds such as SO2, NO2, CO, H2S, lead, ... When entering all living organisms, can block the trachea. Especially for animals. Accordingly, impaired immune system as well as metabolism.

Fruit trees are often very sensitive to changes in the environment. Fruit trees that are heavily exposed to HF can cause mass defoliation. Air pollution also increases global warming, and the impact on human health is the most serious consequence of air pollution. It makes the rate of people suffering from respiratory diseases, cancer, infertility, ... increasing.

Nowadays, the problem of environmental pollution in general and air pollution, in particular, has become a hot issue of public opinion and society. Air pollution causes negative effects on the ecological environment, socio-economy, and especially human health. Therefore, each person should be self-aware and improve their own responsibility to protect the environment.

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