气候变化领域集成服务门户(CCPortal): LETTER Temporal role of crop residue burning (CRB) in Delhi’s air pollution

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DOI	10.1088/1748-9326/abb854
	LETTER Temporal role of crop residue burning (CRB) in Delhi’s air pollution
	Agarwala M.; Chandel A.
发表日期	2020
ISSN	17489318
卷号	15 期号:11
英文摘要	The National Capital Region of Delhi in India is one of the most polluted urban areas in the world, and its intense pollution episodes are attributed to crop residue burning (CRB). However, existing studies are limited in time and pollutant type, and do not often control for non-biophysical factors. We used ground-measured pollutant levels and aerosol optical depth (AOD) data to understand the role of CRB in Delhi’s air pollution from 2015 to 2018. While the CRB peak in October–November is associated with pollution episodes, biophysical conditions in the April–May CRB period allow the pollutants to disperse. Elevation in SO2 and ozone is associated with CRB from more distant source areas than elevations in PM2.5 and PM10: gaseous molecules such as SO2 may travel further than particulate matter; and NO2 may convert to ozone during long-range transport. Pollution levels are very high in December–January despite low CRB in this period. Given the high contribution of biomass burning in this period in source apportionment studies, it is unclear whether the sharp elevation in pollutant levels with temperature drop in this period can be explained only with meteorological conditions, or whether there are unquantified sources contributing to pollutant load in December–January, such as small-scale CRB that is undetected by the MODIS active fire product or local burning for heat. There are limitations to the substitution of ground-measured pollutants with AOD in analyzing drivers of pollution since AOD, unlike ground-measured pollutants, is unable to identify fine-scale drivers such as construction. Further studies that use seasonal emissions inventories, particularly for waste and household burning for heat, are required to understand their contribution to pollution in December–January as they may have a disproportionate impact on pollution and human health. © 2020 The Author(s). Published by IOP Publishing Ltd
英文关键词	December–January; Indo-Gangetic plain (IGP); NO2; Ozone; PM2.5; SO2; Winter
语种	英语
scopus关键词	Agricultural wastes; Crops; Heating; Ozone; Sulfur dioxide; Waste incineration; Aerosol optical depths; Biophysical conditions; Biophysical factors; Crop residue burning; Long range transport; Meteorological condition; National capital regions; Source apportionment; Air pollution; aerosol; atmospheric pollution; biomass burning; crop residue; optical depth; source apportionment; temporal analysis; urban pollution; Delhi; India
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153503
作者单位	Department of Environmental Studies, Ashoka University, Rajiv Gandhi Education City, National Capital Region P.O. Rai, Sonepat, Haryana 131029, India
推荐引用方式 GB/T 7714	Agarwala M.,Chandel A.. LETTER Temporal role of crop residue burning (CRB) in Delhi’s air pollution[J],2020,15(11).
APA	Agarwala M.,&Chandel A..(2020).LETTER Temporal role of crop residue burning (CRB) in Delhi’s air pollution.Environmental Research Letters,15(11).
MLA	Agarwala M.,et al."LETTER Temporal role of crop residue burning (CRB) in Delhi’s air pollution".Environmental Research Letters 15.11(2020).