Air pollution involves the emission of toxic fumes into the air. Everyone in way contributes to air pollution in his/her capacity. Carbon dioxide is among the main pollutants of the air. This gas forms a big percentage of the gases that are emitted in many factories across China. Combustion of fossil fuels and deforestation greatly contribute towards the increased levels of this gas in the atmosphere. It is also emitted during any volcanic activity. It is a major contributor towards global warming. Most automobiles, air jets, and marine vessels also release fume to the atmosphere. Other pollutants include Aerosol sprays, nuclear fumes. Other dangerous gases that pollute the air include carbon monoxide and Sulfur dioxide. "Air pollution can cause acid rain, which occurs whenever sulfur dioxide combines with Nitrogen dioxide" (Hart 2006, p. 62).