气候变化领域集成服务门户(CCPortal): Mitigation of PM2.5 and ozone pollution in Delhi: A sensitivity study during the pre-monsoon period

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DOI	10.5194/acp-20-499-2020
	Mitigation of PM2.5 and ozone pollution in Delhi: A sensitivity study during the pre-monsoon period
	Beig G.; Chen Y.; Wild O.; Ryan E.; Kumar Sahu S.; Lowe D.; Archer-Nicholls S.; Wang Y.; McFiggans G.; Ansari T.; Singh V.; Sokhi R.S.; Archibald A.
发表日期	2020
ISSN	16807316
起始页码	499
结束页码	514
卷号	20 期号:1
英文摘要	Fine particulate matter (PM2:5) and surface ozone (O3) are major air pollutants in megacities such as Delhi, but the design of suitable mitigation strategies is challenging. Some strategies for reducing PM2:5 may have the notable side effect of increasing O3. Here, we demonstrate a numerical framework for investigating the impacts of mitigation strategies on both PM2:5 and O3 in Delhi. We use Gaussian process emulation to generate a computationally efficient surrogate for a regional air quality model (WRFChem). This allows us to perform global sensitivity analysis to identify the major sources of air pollution and to generate emission-sector-based pollutant response surfaces to inform mitigation policy development. Based on more than 100 000 emulation runs during the pre-monsoon period (peak O3 season), our global sensitivity analysis shows that local traffic emissions from the Delhi city region and regional transport of pollution emitted from the National Capital Region (NCR) surrounding Delhi are dominant factors influencing PM2:5 and O3 in Delhi. They together govern the O3 peak and PM2:5 concentration during daytime. Regional transport contributes about 80% of the PM2:5 variation during the night. Reducing traffic emissions in Delhi alone (e.g. by 50 %) would reduce PM2:5 by 15 %-20% but lead to a 20 %-25% increase in O3. However, we show that reducing NCR regional emissions by 25 %-30% at the same time would further reduce PM2:5 by 5 %-10% in Delhi and avoid the O3 increase. This study provides scientific evidence to support the need for joint coordination of controls on local and regional scales to achieve effective reduction in PM2:5 whilst minimising the risk of O3 increase in Delhi. © Author(s) 2020.
关键词	air quality atmospheric pollution Gaussian method megacity monsoon numerical model ozone particulate matter policy development sensitivity analysis traffic emission Delhi India
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132301
推荐引用方式 GB/T 7714	Beig G.,Chen Y.,Wild O.,et al. Mitigation of PM2.5 and ozone pollution in Delhi: A sensitivity study during the pre-monsoon period[J]. Atmospheric Chemistry and Physics,2020,20(1).
APA	Beig G..,Chen Y..,Wild O..,Ryan E..,Kumar Sahu S..,...&Archibald A..(2020).Mitigation of PM2.5 and ozone pollution in Delhi: A sensitivity study during the pre-monsoon period.,20(1).
MLA	Beig G.,et al."Mitigation of PM2.5 and ozone pollution in Delhi: A sensitivity study during the pre-monsoon period".20.1(2020).