摘要
Ozone is a crucial air pollutant that damages human health and vegetation.As it is related to the photo-oxidation of the nitrogen oxides and volatile organic compounds,the summertime reduction of these precursors is the primary focus of current ozone mitigation strategies.During ozone pollution episodes in eastern China,an observed accumulation of daily total oxidants(O_(x)=NO_(2)+O_(3))in cool seasons(spring and autumn:60 ppb and winter 40 ppb)is comparable to that in summer(60 ppb),indicating fast photochemical production of secondary pollutants including ozone over the year.Unrecognized fast radical primary productions are found to counteract the increased termination of hydroxyl radical and unfavorable meteorological conditions to maintain the rapid total oxidant formations in cool seasons.Elucidating and regulating the primary radical sources may be critical for the secondary air pollution control in cool seasons.
基金
supported by the Natural Science Foundation of Beijing Municipality(JQ19031)
the National Natural Science Foundation of China(21976006,21522701,and 91544225)
the National Research Program for Key Issue in Air Pollution Control(2019YFC0214800 and 2018YFC0213800)
the Science and Technology Commission of the Shanghai Municipality(18QA1403600).
