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Guo Y.,CAS Institute of Atmospheric Physics | Guo Y.,University of Chinese Academy of Sciences | Guo Y.,Xinjiang Environmental Monitor Center | Wang Z.,CAS Institute of Atmospheric Physics | And 7 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

With the rapid economic development in recent years, automobile vehicles exhaust emission has become one of main air pollution sources in major Chinese cities. During the time before and after the Spring Festival period in February 5~18, 2013, large amount of automobile vehicles moved outside of Urumqi city 3 days before the Festival, and commercial automobile vehicles were prohibited in business from February 10 to 12. Therefore, we conducted a comparative investigation on the flow rate of automobile vehicles and fuel consumptions in Urumqi city, analyzed the change of hourly concentration on five air pollutions, and studied the potential contribution and impact of air pollution by vehicles exhaust emissions. Results showed that during the period of prohibiting commercial automobile vehicles, the automobile vehicle flow rate apparently decreased, with fuel consumption reduced approximately about 60%. Although the meteorological condition was unfavorable for pollutant dispersion during the Spring Festival, concentrations of PM2.5, PM10, SO2, NO2 and CO dropped to the monthly lowest levels and decreased by 44.2%, 49.3%, 54.5%, 28.2% and 3.67%, respectively, compared with those before the Festival. Consequently, the air pollution in Urumqi was improved after the implementation of 'replacement of coal by natural gas' project, and atmospheric pollution began to change from coal burning into mixed automobile vehicle exhaust emission. Elevating the quality of oil production will reduce the air pollutions from automobile vehicle exhaust emissions. Under the current national standards of oil production, prohibition of commercial automobiles will significantly improve the air quality of Urumqi city during the big Festival.

Li X.,Institute of Desert Meteorology | Guo Y.-H.,Xinjiang Environmental Monitor Center | Lu X.-Y.,Xinjiang Meteorological Observatory | Gulgina H.,Xinjiang Meteorological Information Center | And 7 more authors.
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2016

Measures mainly based on the Coal to Gas Engineering (CTGE) for heating between 2012 and 2013 were taken to improve the air quality in Urumqi. In this paper, a comprehensive study was conducted to evaluate the effects of these measures on atmospheric environment in Urumqi by using the data of the concentrations of major air pollutants during wintertime of 2009~2014, the direct radiation, visibility, hazy days between 1993~2014. The results show that the concentrations of PM10, SO2 and NO2 in Urumqi during the wintertime of 2013~2014 decline by 26.1%, 80.2% and 11.6% respectively compared to those in the wintertime of 2009~2011 which represent the concentrations before CTGE. The ratio of total water-soluble matter to PM2.5 also decreases by 20.57%. The top three ions' concentrations in PM2.5 are SO4 2, NH4 + and NO3 -before and after the CTGE. However, there is 50% decrease of the mass fractions of SO4 2-and NH4 + in PM2.5 after the CTGE, and the mass fraction of NO3 -in PM2.5 remains unchanged. In the view of atmospheric physics, the total direct radiations during the wintertime in Urumqi increase after the CTGE and the value of 2013~2014 reaches up to the second peak for the past 23 years. There is a 5.7 km increase for the wintertime visibility of 2013~2014 which is the maximum value since 1997. At the same time, there are 15days less for the wintertime hazy days of 2012~2013 compared to that of previous year which is a decrease of 50%. The results and analysis indicate that the CTGE for heating improved the atmospheric environment in Urumqi to a certain extent. © 2016, Chinese Society for Environmental Sciences. All right reserved.

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