Effect of Urbanization on Ozone and Resultant Health Effects in the Pearl River Delta Region of China
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AbstractThe United Nations has reported that 55% of the global population resides in urban areas, and 68% of the population is expected to be urban dwellers by 2050. Urbanization has critical implications for global land cover. Relevant literature has provided evidence attributing climatic effects to urban expansion; however, few studies have investigated the effect on public health and pollutant sensitivity to emissions. This study aimed to characterize the effect of urbanization‐induced changes in regional climate on ozone (O3), to evaluate ozone sensitivity to nitrogen oxide (NOx ) and volatile organic compound (VOC) emissions, and to estimate premature mortalities due to O3 exposure. We employed atmospheric models with the higher‐order decoupled direct method to simulate effects of urbanization on O3 and to determine O3 sensitivity to NOx and VOC emissions. China‐specific concentration response functions were utilized to estimate cardiovascular and respiratory mortalities due to ozone exposure. Urbanization increased O3, which translated to a 39.6% increase in O3‐induced premature mortality (1,100 deaths). Moreover, O3 has become less/more sensitive to unit changes in NOx and VOC emissions in various cities. Urban greening may reduce urban temperature, but it may increase O3 in some cities due to the additional VOC emissions of greening. These findings highlight the strong interactions between land use policies, urban climate adaptation strategies, and air quality policies, suggesting the need of cobeneficial strategies and policies. We proposed a precision environmental management concept that emphasizes the importance of considering the specific atmospheric condition and composition of a city when formulating its environmental policies.
Acceptance Date08/09/2019
All Author(s) ListSteve Hung Lam Yim, Mengya Wang, Yefu Gu, Yuanjian Yang, Guanghui Dong, Qingxiang Li
Journal nameJournal of Geophysical Research: Atmospheres
Year2019
Month11
Day16
Volume Number124
Issue Number21
Pages11568 - 11579
ISSN2169-897X
eISSN2169-8996
LanguagesEnglish-United States

Last updated on 2020-27-11 at 23:47