Reactivity and Health Risk Assessment of VOCs in Winter in Southern Suburbs of Xi'an
From December 2020 to February 2021,55 kinds of VOCs in the southern suburbs of Xi'an were monitored.The formation potential of O3 and secondary organic aerosols in VOCs was calculated by maxi-mum incremental reactivity coefficient and aerosol formation coefficient,respectively,and the health risks were evaluated.Results showed that the concentration of VOCs ranked as alkanes＞aromatics＞aldehydes/ketones＞al-kenes＞alkynes.Considering species reactivity,p-/m-xylene,ethylene and hexanal were the top three contribu-tors to the formation of O3,and p-xylene,toluene and ethylbenzene were the top three contributors to the forma-tion of secondary organic aerosols.Priority control of aromatic hydrocarbons,aldehydes and ketones,alkenes emission was crucial in reducing O3 pollution in winter in Xi'an.Benzene and ethylbenzene may be carcinogenic risk to human body,and prevention and control measures should be strengthened in the future.
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