u Life stoves and heating boilers In the residential district, with the concentration of the population, a large number of civilian life, heating stoves and boilers need a considerable amount of coal, especially in the winter heating time, so that the contaminated areas are often filled with smoke, this is also a source of air can not be ignored .
v Transportation In recent decades, due to the development of transport, increasing the city of cars, trains, ships and airplanes, frequent passenger and freight transport, which gave the city added a new air pollution sources. Significance of which is motor vehicle emissions. Car pollution of the atmosphere is characterized by a range of pollutants emitted close to the breathing zone of people, can be directly inhaled. Automobile engine emissions are mainly consisted of carbon monoxide, nitrogen oxides, hydrocarbons (hydrocarbons), lead compounds.