| This report is based on the investigation of the coastal city?City T?in Yangtze River Delta,First,getting the air automatic monitor data to analyze the correlation among particle concentration and meteorological factors,other air pollutants.Contraposing social development and industrial development features,collected 7 kinds of typical pollution sources,for a total of 38,meanwhile,with the field research in T,set 6 sampling site,getting PM2.5 environmental receptors samples in all seasons,for a total of more than 840 samples.Analyzed 19 kinds of inorganic elements,8 kinds of water soluble ions,2 kinds of carbonaceous components and 16 kinds of PAHs of PM2.5 in pollution sources and environmental receptors,to study the pollution characteristics of PM2.5.Analyzed the source characteristics of PM2.5 by the Chemical Mass Balance method?CMB?to provide a basis for studying the pollution characteristics of PM2.5 in coastal cities in Yangtze River Delta,and for proposing some control measures accordingly.The main results are:?1?The concentration variation of PM10 in the typical coastal cities in Yangtze River Delta?City T?were consistent with PM2.5,highest in winter and lowest in summer.There was no correlation between particles and temperature,atmospheric pressure.However,particles was proved having a negative relation with relative humidity,wind speed and visibility,and having good correlation with NOx,SO2 and CO.The ratio of PM2.5 to PM10 in T was higher than Wenzhou and Ningbo.?2?Urban fugitive dust,construction dust,road cumulated dust were composed primarily of OM,Ca,Si,etc.In T city,soil dust were composed primarily of Si,Al,Fe,OM,etc.,coal ash were composed primarily of Ca,EC,Si,SO42-,etc.,metallurgical dust were composed primarily of Fe,Ca,OM,etc.,trash incinerators dust were composed primarily of OM,Ca,EC,etc..The order of PM2.5 concentrations was industrial area>urban area>background site.OM accounted for 23.8%of the total PM2.5,SO42-,NO3-and NH4+ accounted for 15.6%,15.0%and 11.4%.respectively.The proportions of the PAHs with different rings,ratio method results and Principal Component Analysis results suggested that the PAHs in PM2.5 were mainly date from vehicle exhaust,coal combustion and biomass burning.The yearly value of Excess lifetime cancer risk?ILCR?for adults and children was 8.02×10-7 and 5.61×10-7,respectively,which was similar to the risks of everyday activities.?3?The primary source of PM2.5 in T city was industrial production,accounting for 23.9%,followed by vehicle exhaust emission,raise dust and coal combustion,accounted for 21.4%,19.4%,12.1%,respectively,other sources accounted for 23.3%.According to the results of sources apportionment of PM2.5 in T city,based on the real condition,this research proposed some prevention advice for PM2.5 pollution,including industrial production,coal combusion,vehicle exhaust emission,raise dust,etc. |
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