Chongqing Academy of Environmental science Chongqing Environment Monitoring Center

Chongqing, China

Chongqing Academy of Environmental science Chongqing Environment Monitoring Center

Chongqing, China
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Zhang C.,Chongqing Academy of Environmental science Chongqing Environment Monitoring Center | Zhou Z.,Chongqing Academy of Environmental science Chongqing Environment Monitoring Center | Zhai C.,Chongqing Academy of Environmental science Chongqing Environment Monitoring Center | Chen G.,Chongqing Academy of Environmental science Chongqing Environment Monitoring Center | And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2014

In order to understand affect of main meteorological factors on black carbon (BC) aerosol and sources of BC in Chongqing, correlation analysis of BC between main meteorological factors and SO2, NOx derived from coal combustion and vehicles exhaust emission sources was conducted. Relationship between BC concentration and traffic volumes during 24 hours was also discussed. The results showed that, annual average concentration of BC was (5.9±2.7) μg·m-3 in 2012, accounting for 7.2% of PM2.5. Hourly BC concentrations were higher during 6:00 to 10:00 and 20:00 to 23:00. Wind speed was the most important meteorological factor for BC concentration, while the effects of temperature and relative humidity were insignificant. BC concentrations decreased with increasing wind speed when the wind speed was from 0.5 m·s-1 to 1.5 m·s-1, and increased with increasing wind speed when the wind speed exceeds 2 m·s-1. Correlation coefficients of BC between SO2 and NOx were 0.374 and 0.542 (p<0.01), respectively, which showed that BC was also mainly from coal combustion and vehicle exhaust emissions. The variety of BC concentrations and traffic volumes during 24 hours showed that, in addition to the impact of meteorological conditions, diurnal variation of BC concentrations was also influenced by vehicles patterns especially heavy-duty diesel vehicles. Controlling of diesel vehicles should be prioritized in order to control BC pollution in urban area of Chongqing.

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