Pollution Characteristic and Source Apportionment of Ambient Volatile Organic Compounds(VOCs)Based on a Joint Observation in 13 Cities of Jiangsu Province
Jiangsu Province is an important component of the Yangtze River Delta region.In recent years,regional complex pollution characterized by ozone(O3)and fine particulate matter(PM2.5)has become prominent.Volatile organic compounds(VOCs)are important precursors of O3 and PM2.5.The offline synchronous observation of ambient VOC samples was carried out in 13 cities of Jiangsu Province in April 2020,August 2020,and January 2021.The concentration level,chemical composition,and spatial distribution of ambient VOCs in Jiangsu Province were analyzed.Overall,the average volume mixing ratio of VOCs in Jiangsu Province was 40.3×10-9,of which alkanes(41.8%)were the main contributors,followed by oxygenated organic compounds(16.6%),aromatics(12.5%),halocarbons(12.9%)and alkenes(9.6%).From the perspective of specific cities,high VOC values were mainly concentrated in southern and central Jiangsu,showing obvious regional distribution characteristics of a"high in the south and low in the north"pattern.The top 3 cities were Changzhou(52.0×10-9),Taizhou(49.8×10-9),and Suzhou(45.2×10-9),respectively.Ozone formation potential showed that aromatics and alkenes were components that contributed the most to O3 formation in Jiangsu Province.The top 3 VOC species with high OFP values were m/p-xylene,toluene,and ethene,respectively.A positive matrix factorization model was used to analyze the source of VOCs in Jiangsu Province,and a total of 5 factors were resolved.Industrial emissions were the main contributor(40.1%),followed by vehicle exhaust(33.0%),solvent and paint usage(15.9%),gasoline evaporation(8.4%),and biogenic emission(2.6%).The source profile of VOCs showed differences for the individual city in Jiangsu Province.Changzhou and Suzhou showed the highest relative contribution of industrial emissions,while Lianyungang,Xuzhou,Yangzhou,and Huai'an showed the relatively high contribution of vehicle exhaust;The source contribution of solvent and paint usage and gasoline evaporation were lower than other sources in all cities.Priority control of traffic-related emissions and industrial-related emissions can effectively control atmospheric O3 and PM2.5 pollution in the central Yangtze River Delta region.
ozonevolatile organic compoundspollution characteristicssource apportionmentJiangsu Province
NETL
NSTL
万方数据
