Assisted treatment methods to increase the dispersion waters, increasing the green roof, floor, exterior walls increase photocatalyst coating or with Chi, strengthen supervision cars, improve vehicle tail gas emission standards. The shortcomings of traditional methods of planting trees and grass control: haze days occurred mainly in low relative humidity in winter and spring, when self-purification capacity of the plant is very limited; thermal power plant pollution control: coal-fired power plants, etc. Basically scrubber has been installed, If further improve emission standards, will greatly increase the cost of thermal power, when the costs to lead to a substantial increase in social costs, and the share of thermal power plants PM2.5 pollution in the city is a small part; combustion treatment of crops: Control burning crops will lead to a substantial increase in government costs and difficult to control, to protect the interests of farmers, the government is difficult to formulate restrictive terms, even if developed, it is difficult to implement. The crop wastes (eg straw) processing to achieve subsidies will not last forever. For farmland, burning crops benefits outweigh the disadvantages, even if the pollution and its toxicity is low. Before large-scale integrated agriculture is not production, crop waste disposal is still difficult to solve. For example: the government invested a lot of money to repair marsh pond, but the high labor costs of its maintenance, resulting in a lot of people give up, and the use of liquefied petroleum gas. Industrial emissions of pollution control: relocation and control of industrial pollution, although industrial areas to solve the pollution concentration, one area to another makes more dispersed pollution, atmospheric background concentration value higher. Improved technology will control the sources of pollution, but a short time to improve emission standards will be making many small businesses unbearable, will result in imposition of a regional economic problems. Automotive pollution control: improving the emission standards to be gradual phase-out of old cars, which makes three to five years automotive pollution control is difficult to achieve, and automobile pollution has become a major source of pollution in urban PM2.5.