An Analysis And Research Of Present Atmospheric Environment In Northwest Region(Gansu、qinghai、xinjiang)

With the rapid development of national economy and the continuous expansion of city size, atmospheric pollution of city and urban agglomeration is becoming more and more serious. Recently, the air quality situation in our country remains extremely grim. Regional atmospheric pollutants characterized by the particulate matter (PM10) and fine particulate matter (PM2.5) are increasingly prominent, which harm people’s health, affect social harmony and stability. This paper studys the atmosphere strategic environmental impact assessment in the western region, discusses the fragile ecological environment, water resources lack of regional air pollution situation and impact factors of work, in order to put forward the proposal for prevention and control of atmospheric pollution and adjust measures to local conditions to carry out the governance. Prevention and control of atmospheric pollution should be promoted from three aspects as production, life and ecology coordination.lt will realize the sustainable development of social economy and ecological environment coordinate model, avoid a repeat of "pollution first, treatment" in the central east area. For the northwest region to curb atmospheric pollution, improve the air and the quality of life, economic and social sustainable development and ecological environment of lasting protection.This study analyzed the atmospheric meteorological cause of environmental pollution, air quality status and evolution of emission, air pollution area present situation and the evolution in the northwest province. The contribution of areas’mutual transfer and typical urban pollutants concentration is also analyzed,by using the numerical model of atmospheric environment quality present situation of comparative analysis.1、The meteorological causes affecting atmospheric environment pollution of the Northwest Province are diverse and complex. Special geographical conditions of mountains, valleys, basins intertwined resulting in many cities in the relatively closed natural environment; Many of the key cities of calm wind small wind days of annual average number of days more than200days, the cumulative effect of these significant local urban air pollutants; Dust weather high incidence, mainly inHotan and Kashgar region of Southern Xinjiang and the Eastern Xinjiang, consistent with the annual average concentration of particulate matter high value, so dust weather is one of the important causes of particulate matter in the region led to pollutants.Pollution meteorological conditions in Northwest showing wind farm complex, inversion and often present a greater intensity and other characteristics, atmospheric transport in many parts of the proliferation of poor conditions. Airflow to reach these key cities are mainly northwest and west air mass in2010, the principal effects of long-range air mass Hami, Urumqi, Xining and Lanzhou regions, distance air masses have significant influence on the six cities, Close air mass in hami, jinchang, and great influence in lanzhou.2> The most part northwest provinces cities the annual concentration of SO2, NO2can satisfy the standard of secondary air quality, and only in Urumqi and Jinchang annual concentration of SO? than secondary standard, Annual average concentration of NO2in Urumqi, Changji and Lanzhou over the new secondary standard value; With the implementation of new air quality standards, Several major pollutant concentration in the region exceeded the city increased significantly, especially in many parts of PM10concentration will exceeds bid badly, so the air quality standard extremely arduous task. The past10years, the air quality in major cities in the Northwest Provinces gradually improved, the primary pollutant is particulate matter PM10. On the whole, SO2overall up to standard, the key cities of SO2over secondary standard; The annual concentration NO2standard in good condition; Annual average concentration of particulate matter exceeded the high proportion.3、The main air pollutant emissions continue to increase, reduction pressures.In2010, SO2, NOx, soot and dust emissions of Northwest Provinces, respectively for1.2837million tons,1.0056million tons,1.2837million tons and374700tons, accounting for the proportion of the national were5.8%,5.4%,7.0%and5.4%, emissions of various pollutants is the largest in Xinjiang, Gansu, followed Qinghai least. From2006to2010changes in emissions point of view, in addition to dust outside, SO2, NOx and soot emissions showed an upward trend, in addition to NOx is consistent with the national trend, the other three pollutants trends with the National contrary. Geographically, Baiyin, Urumqi, Changji and Hami are the largest emitters of SO2, NOx, soot and dust. 4、The high concentration region of Northwest Provinces SO2and NO2in four typical months and the annual average are at Urumqi-Changji-Shihezi-Kuitun along the northern slope of Tianshan and Xining-Lanzhou-Baiyn-Jinchang City Economic Circle, January average concentration and influence scope is larger, April is minimal. Relative to the rest of the country, PM10and PM2.5concentrations Northwest Provinces caused by anthropogenic emissions are not high, eastern and southern regions of Gansu PM10and PM2.5concentration is relatively high; From the spatial distribution of annual average concentration, O3concentrations were positively correlated with altitude, and negatively correlated with nitrogen oxide emissions, Urumqi, Changji, Lanzhou and Baiyin prefecture of O3value is not high, their annual average concentrations between40-50ug/m3. In most regions of Northwest Provinces of SO2and NOx pollutant concentration mainly come from the local emissions,70%-90%, less affected provinces zone. Lanzhou and Urumqi are the largest contributor to the concentration of SO2and NO2in several areas of its surrounding, A typical urban sources of pollutant are mainly from the local contribution. Secondary pollutants sulfate local contribution rate is less than the concentration of a pollutant contribution rate, a greater contribution to the surrounding cities, showing long-distance transmission characteristics.