Causes of air pollution are due to natural phenomena: volcanism, forest fires, dust storms, or decomposition, decay, etc. - This is an objective reason. It is difficult to predict and prevent. Air pollution due to human factors: the harmful gases emitted by the industry, the smoke from the vehicles. In addition, cooking uses fuel. Generate toxic gases that cause local pollution in households and surrounding households .... To overcome, we need to plant more trees, air filter by biological method, exhaust treatment by biotechnology, ....