A Review Study on Air Pollutants

Sources of air pollution includes pollutants emitted by mobile sources like automotive vehicle, air planes, and marine ships. Many of these pollutants mainly carbon dioxide, oxides of nitrogen, sulphur dioxide etc. contribute to environmental degradation and have negative effects on human health. To protect human from health point of view and the environment, environmental regulatory agencies such as the US environmental protection agency have established policies to minimize air pollution from mobile sources. Similar agencies exist at the country level. Due to the large number of mobile sources of air pollution, and their ability to move from one location to another, mobile sources are regulated differently from stationary sources, like power plants and other industries and public in urban and semi urban areas using and combusting directly in their furnaces and cooking stoves. Instead of monitoring individual emitters, such as an individual vehicle, mobile sources are often regulated more broadly through design and fuel standards. The increase in the number of motor vehicles driven in the world has made efforts to limit mobile source pollution challenging. As a result, there have been a number of different regulatory instruments, implemented to reach the desired emissions goals.