- Characteristics and source apportionment of ambient VOCs during alternating period between winter and spring in Nanyang City, Henan Province
- 南京信息工程大学环境科学与工程学院, 南京 210044
- 南京科略环境科技有限责任公司, 南京 211800
- Abstract：Ground-level ozone (O3) pollution in middle areas of China has received much concern during recent years. Volatile organic compounds (VOCs) play important roles in photochemical production of ozone. In order to understand characteristics and sources of ambient VOCs in middle areas, one-month online VOCs measurements were conducted at Nanyang Institute of Technology (NIT) site in Nangyang City, Henan Province during February-March, 2017. The mean value of mixing ratios for measured VOCs was (37.4±18.5)×10-9. Alkenes and aromatics were the two largest contributors to ozone formation potential (OFP), with relative contributions of 37% and 28%, respectively. Ethylene, xylenes, toluene, propene, and C4~C5 alkanes were the most important VOCs species to OFP. The positive matrix factorization (PMF) model was used to investigate VOCs sources in Nanyang and four factors were resolved, including usage of natural gas and liquefied petroleum gas (LPG) + background, traffic-related emission, usage of paints and solvents, combustion of coal and biomass. The factor combustion of coal and biomass is the largest contributor to ambient VOCs, with relative contribution of 35%, followed by traffic-related emission (25%), usage of natural gas and LPG+ background (23%), and usage of paints and solvents (17%). These results from this study will be useful to understand VOCs sources in mid-areas of China, and further provide basic data and useful information to formulate strategy for VOCs and O3 control.