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Objective To analyze the spatial and temporal characteristics of the major air pollutants in Urumqi, evaluation of environmental changes in air quality conditions, and to provide a scientific basis for the Prevention of Air Pollution in Urumqi. Analysis the Urumqi 2004-2009 ambient air quality monitoring data in 2007, the first national pollution census results and the 2009 results of census of pollution sources updated control ambient air quality standards and the scope of the air pollution index and corresponding air quality category \1 of sulfur dioxide in the ambient air, the average annual concentration of respirable particulate matter exceeded the national secondary standard primary pollutant is particulate matter, followed by sulfur dioxide. 2, the heating period ambient air pollution is serious, non-heating the air quality is good. Heating period is the period of year, the most serious air pollution, sulfur dioxide, respirable mean concentration of particulate matter exceeded significantly. Which exceeded 2.50 to 3.45 times the heating period, the mean concentration of sulfur dioxide, respirable particulate matter (PM10) mean concentration in excess of 1.72 to 2.31 times. Non-heating period, sulfur dioxide, respirable particulate matter concentration standards. 3, nitrogen dioxide annual average concentration standards are still capable, but the overall upward trend; addition to the coal-fired source, also accounted for a significant share of motor vehicle exhaust contribution. 4, 69.66% of the total soot emissions from industrial sources, 30.34% from domestic sources; 91.91% of the total sulfur dioxide emissions from industrial sources contribution, 8.09% by the life source emissions; 95.19% of the nitrogen oxide emissions from industrial sources, 4.81% for the life of the source contributions to industrial sources is one of the largest pollution emission sources. 5, the production and supply of electricity, heat generation and industrial sources of sulfur dioxide emissions of the city the largest contribution, accounting for 61.25% and 63.41% of the city's industrial sources, and most of the sulfur dioxide has been effectively controlled, directly discharged into the atmospheric environment. Pollutant Emission Reduction of the electricity industry in the coal combustion process, dust measures are significantly superior to thermal industry, heat production and supply industry is the largest the city industrial source soot emissions. Conclusion Urumqi air pollution soot pollution, inhalable particles remains the primary pollutant. Non-heating period, the city's air quality is good, and respirable particulate matter in the ambient air of the heating period, the concentration of sulfur dioxide is higher than the standard. With the sharp increase in motor vehicle ownership, the concentration of nitrogen dioxide on the rise. Industrial source is the largest source of emissions of atmospheric pollutants in Urumqi.
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