Journal
CHEMOSPHERE
Volume 263, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128025
Keywords
Volatile organic compounds; EKMA; Emission ratios; Source appointment
Categories
Funding
- Natural Scientific Foundation of China [41977305, 41761144056]
- Provincial Natural Science Foundation of Jiangsu [BK20180040]
- Jiangsu Innovation & Entrepreneurship Team
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_0927]
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Online measurements of atmospheric VOCs were conducted in Nanjing City to investigate the sources of VOCs. It was found that vehicle exhausts were one of the main sources, and controlling VOC emissions from local vehicle exhaust might be an important way to decrease VOC pollution in Nanjing.
Atmospheric volatile organic compounds (VOCs) are not only harmful to human health, but also lead to ozone (O-3) formation. From July 3 to August 1 of 2018, online measurements of atmospheric VOCs were conducted in Nanjing City, in order to investigate the source apportionments to VOCs since the Empirical Kinetic Modelling Approach (EKMA) suggested that O-3 formation was VOC-limited at the receptor site. Using positive matrix factorization (PMF) model, we quantified eight sources of VOCs, including vehicle exhausts (23%), industrial source (18%), fuel evaporation (17%), petrochemical industry (12%), solvent usage (12%), biogenic emission (8%) and liquefied petroleum gas (7%) along with gasoline additive (3%). The diurnal distributions showed that the contributions of traffic-related sources maximized during the traffic rush hours. In contrast, biogenic sources had the highest contribution at noontime. Backward trajectory results showed that local traffic emissions were the main sources of VOC in Nanjing. Our results revealed that strict control of VOC emissions from local vehicle exhaust might be an important way to decrease high VOC pollution in Nanjing. (C) 2020 Elsevier Ltd. All rights reserved.
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