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Effect of COVID-19 lockdown on the concentration and composition of NR-PM2.5 over Ahmedabad, a big city in western India
Urban Climate ( IF 6.4 ) Pub Date : 2021-03-11 , DOI: 10.1016/j.uclim.2021.100818
Jay Dave , Rohit Meena , Atinderpal Singh , Neeraj Rastogi

This study investigates the impact of reduced anthropogenic emissions during the lockdown period on the concentration, composition, and characteristics of non-refractory particular matter ≤ 2.5 μm aerodynamic diameter (NR-PM2.5) and black carbon (BC) at Ahmedabad, a big city in western India. Online measurements were performed from February 29 to March 23 (before lockdown, P1), April 10 to May 01 (during the lockdown, P2), and June 1 to June 16 (post lockdown, P3) using a high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS) and an Aethalometer. On average, organic aerosols (OA), NO3, SO42−, NH4+, Cl, BC at 370 nm (BC370), and BC at 880 nm (BC880) were reduced by 52, 64, 43, 62, 86, 52, and 57%, respectively, during P2 compare to P1. However, the diurnal trends of species were similar during the lockdown and no-lockdown periods. Source apportionment of OA using positive matrix factorization analysis revealed three factors: hydrocarbon–like organic aerosol (HOA), low volatile oxygenated OA (LV-OOA), and semi-volatile oxygenated OA (SV-OOA), contributing 26%, 44% and, 30%, respectively, to the total OA during the study period. Such studies are very crucial in assessing the effects of reduced anthropogenic emissions on the air quality of big cities, and planning appropriate mitigation strategies.



中文翻译:

COVID-19锁定对印度西部大城市艾哈迈达巴德NR-PM 2.5浓度和组成的影响

这项研究调查了在大城市艾哈迈达巴德,锁定期间人为排放量减少对≤2.5μm空气动力学直径(NR-PM 2.5)和黑碳(BC)的非难熔特殊物质的浓度,组成和特征的影响在印度西部。在线测量是在2月29日至3月23日(锁定之前,P1),4月10日至5月01日(锁定期间,P2)以及6月1日至6月16日(锁定后,P3)使用高分辨率时间进行的。飞行气溶胶质谱仪(HR-ToF-AMS)和湿度计。平均来说,有机气溶胶(OA),NO 3 -,SO 4 2-,NH 4 +,氯-,BC在370nm(BC 370和(BC BC在880纳米880)通过降低52,64,43,62,86,52,和57%,分别P2期间比较P1。但是,在禁闭期和非禁闭期,物种的昼夜趋势相似。使用正矩阵分解分析得出的OA的源分配显示了三个因素:类烃类有机气溶胶(HOA),低挥发性氧化型OA(LV-OOA)和半挥发性氧化型OA(SV-OOA),分别占26%,44%在研究期间占总OA的30%。此类研究对于评估减少人为排放对大城市空气质量的影响以及规划适当的缓解策略至关重要。

更新日期:2021-03-19
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