PM2.5 pollution in Beijing not only causes the greatest health problems, and reduces the visibility (haze), but also impacts on the China governments credibility and international image. The paper showed that the average mass concentration of PM2.5 in Beijing was 103μg/m 3 in the first half year of 2013; the annual mean mass concentration of PM2.5 has risen in recent years; the transfer of regional pollution, motor vehicles, coal combustion and dust are the major sources of PM2.5 during 2012 in Beijing; and finally the government should take effective measures to control PM2.5. The paper may provide some theoretical guidance for the government implementing environmental protection policy and pollution control measures.

Medical waste is a special category of waste with potential health and environment risks. Medical waste management and disposal is a difficult problem in the western China because the shortage of financial support. Kunming city was selected to assess the current achievement and experience of medical waste management and disposal. Kunming municipal government solved the problem of medical waste disposal by adopting the model of BOT (Build-Operate-Transfer). The analyzed results showed that there was a good achievement of medical waste disposal in Kunming city that medical waste disposal realized centralized and normalized disposal, and centralized disposal had amounted to one hundred percent in urban area since 2006. Medical waste disposal in Kunming city mainly includes three steps, that is,the sort and collection of respective medical institutions, the centralized collection and transport of Kunming Center for Medical Waste Centralized Disposal (KCMWCD) and incineration . Kunming municipal government approved franchise for Medical waste disposal. The government has strengthened the medical waste disposal by building the effective administrative monitoring system of medical waste, organizing some meetings and visiting the place of medical waste disposal for relevant person and training them, and imposing the medical waste disposal fee on medical institution.

Air pollution causes health problem. The paper simply analyzed the changes of air quality in the Yuxi city urban area from 2006 to 2012. In the Yuxi city urban area between 2006 and 2012, SO2 levels increased about 43.9 percent; NO2 levels increased about 13.3 percent; PM10 levels in 2012 decreased about 1.5 percent. By evaluating the air quality in the Yuxi city urban area, the results showed that air quality index was the maximum in 2009, and the quality of the air in Yuxi became worse from 2006 to 2012, air pollution in 2009 was the heaviest between 2006 to 2012. After adopting P.R.C EPA air quality standards (GB3095-2012) in 2013, the first air pollutant in Yuxi is PM10, and then it is SO2 among SO2, NO2 and PM10.Much should beend done to reduce the amount of PM10 and SO2 released.

Combined with the sample monitoring of our research and the previous studies of algae growth kinetics,the total algae biomass of Xinyun Lake that can been gathered and removed was fast estimated as 1218800m3/a. Based on the research work about the result of organic fertilizer from algae paste, the internal pollution load reductions of COD, NH4-N and available phosphorus were estimated as 13163.04t, 1018.91t and 146.26t, respectively, in 2012. At last, the environmental benefit, economic benefit and social benefit of organic fertilizer from algae were analyzed, and all of them were very significant.

To solve the problem of short-circuit of individual current constructed wetland, a baffled constructed wetland was designed and applied to treat domestic sewage by our research group. The wetland plants were composed of Eichhormia crassipes, Oenanthe javanica, Cyperusalternifolius, Phragmites communis and Aquatic. The results of 18 month indicated that the optimal hydraulic load of baffled constructed wetland was 2.0~2.2 m3/(m2•d). At the hydraulic load of 2.0m3/(m2•d), the COD, TN and TP removal rates of baffled constructed wetland could be over 76.40%, 76.12%, 65.37%, respectively, at 24°C. When the temperature decreased to 12°C, the COD, TN, TP removal rates of system decreased to 67.56%、62.75% and 61.33%, respectively; The SS removal rate of the first 6 compartments was about 79.5% and that of system could maintain 87.18% during the operation of system. Based on the results of trial, the mechanisms of extending the baffled constructed wetland's operational life was owed to high efficient SS removal rate of the first 6 compartments which was used as constructed wetland and anaerobic baffled reactor (ABR). As a result, the long-term stable operation of system in treatment of domestic sewage was explained with extending about 5 times service life than that of individual current constructed wetland. The mechanisms of higher efficiency of baffled constructed wetland in treatment of domestic sewage were owed to the longer flow line of system and the up-down flow of domestic sewage makes pollutant more intimate contact with roots of wetland plants.