The Spatiotemporal Variation Characteristics of Main Air Pollutants in Urumqi during 2006 to 2010

Objective To analyze the spatiotemporal variation characteristics of main air pollutants in the city of Urumqi during 2006 to 2010.Methods The environmental monitoring data of PM10,SO_2 and NO_2 in Urumqi during 2006-2010 were collected,the yearly and regional,heating seasonal and non -heating seasonal characteristics were analyzed,then a comprehensive assessment was done.Results The annual average concentration of main air pollutants including PM10 and SO_2 decreased as a whole.The annual concentration of SO_2 has reduced 22.6%and the PM10 reduced by 11.9%compared with the same term in 2006.Nevertheless,the annual concentration of NO_2 increased by 4.7%.The concentration of main air pollutants in the non-heating season all met the national GradeⅡair quality standard and the concentration of PM10 and NO_2 in the non-heating season all increased.The concentration of SO_2,PM10 and NO_2 in the heating season was 6.0-7.4,1.7-3.4, 1.4-1.7 times as that in the non-heating season,respectively.And the south of city had undergone higher pollutants concentrations.Conclusion The air quality keeps stable and to be improved continuously in Urumqi during 2006-2010. Combined pollution characteristics in non-heating seasons and coal smog pollution characteristics in the heating seasons have been observed in the present investigation.