the air we breathe can be contaminated by pollutants from industries, vehicles, power plants, harmful chemicals and many other sources. These pollutants are a big problem for the damaging effects they may have in relation to health or the environment in which we live. Their impact depends on various factors, such as the amount of air pollutant to which it is exposed, the duration of exposure and the dangerous of the pollutant itself. The health effects may be minor and reversible such as irritation of eyes or debilitating such as a worsening of asthma or even death such as cancer.