The characteristics and source apportionment of VOCs during ozone polluted period in summer in an industrial area of southwest Shanghai
An observation site was set up near the provincial boundary industrial area in Jinshan District,Shanghai,to observe the concentration of 104 volatile organic compounds(VOCs),nitrogen oxides(NOx),and ozone(O3)in the air from August 1-31,2020.During the observation period,the hourly mass concentration of O3 ranged from 17 to 262 μg/m3,with a mean value of 83 μg/m3.Two O3 pollution episodes occurred during the period,with O3 hourly mean values of 119,110 μg/m3,respectively.The volume fraction of total VOCs(TVOCs)during the observation period was 66.67 × 10-9,VOCs showed a trend of low during the daytime and high at night,and the diurnal variation of VOCs component was consistent with that of TVOCs.The total ozone generating potential(OFP)of the VOCs was 578.85 μg/m3,and alkenes contributed the most to the OFP.The results of the source analysis showed that the VOCs in both pollution periods were related to vehicle exhaust and paint solvent usage,so the control of the two VOCs sources should be strengthened.The backward trajectory clustering analysis showed that the high-value air masses of VOCs in the two pollution periods came from the sea,and in addition to the regional transport from the neighboring cities,the emission sources from the sea need to be paid more attention.
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NSTL
万方数据
