Impact of lockdown on particulate matter concentrations in Colombia during the COVID-19 pandemic.
Impact of lockdown on particulate matter concentrations in Colombia during the COVID-19 pandemic.
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DOI：
10.1016/j.scitotenv.2020.142874
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发表时间：
2021-04-10
期刊：
影响因子：
--
通讯作者：
Restrepo G
中科院分区：
文献类型：
--
作者：
Arregocés HA;Rojano R;Restrepo G
哥伦比亚于2020年3月6日报告了首例新冠肺炎确诊病例。因此，3月25日宣布强制实施预防性隔离。这些措施包括暂停经济活动和大幅度减少道路上的车辆数量。本研究的目的是评估新冠肺炎大流行导致的封锁对5个监测站PM2.5浓度和Terra/MODIS卫星气溶胶光学深度值的影响。我们分析和比较了2020年1月6日至6月22日这一周封城前和封城期间PM2.5的周浓度和月浓度，并比较了2018-2020年1月至6月Terra/MODIS卫星获得的日值，以阐明封城的影响。与世界上其他监测点类似，我们观察到PM2.5每周浓度大幅下降，从41%降至84%（波哥大<e:1>），从13%降至66% (Funza)，从17%降至57% (boyac<e:1>)，从35%降至86%（巴列杜帕尔），31%降至60%（利萨拉尔达）。与其他研究不同，在封锁期间，气溶胶光学深度值与前几年相比增加了59%，与封锁前相比增加了每周平均值的70%。哥伦比亚地区PM2.5和气溶胶光学深度的这些时空行为受到隔离期间车辆流量减少、区域降雨和行星边界层高度的影响。经济活动的排放影响了该地区的污染物水平。对封锁期间污染物水平的分析为监管机构制定缓解计划提供了基线。
The first confirmed case of COVID-19 in Colombia was reported on March 6, 2020. For this reason, on March 25, preventive isolation was declared mandatory. These measures involved the suspension of economic activities and drastically reduced the number of vehicles on the road. The objective of this study is to evaluate the impact of the lockdown due to the COVID-19 pandemic on PM2.5 concentrations at 5 monitoring stations and aerosol optical depth values of the Terra/MODIS satellite. We analyzed and compared the weekly and monthly concentrations of PM2.5 before and during the lockdown between the week of January 6 to June 22, 2020, and compared the daily values obtained from the Terra/MODIS satellite for the months of January–June during the years 2018–2020 to elucidate the effects of the lockdown. Similar to other monitored sites in the world, we observed substantial reductions in weekly PM2.5 concentrations, from 41 to 84% (Bogotá), from 13 to 66% (Funza), from 17 to 57% (Boyacá), from 35 to 86% (Valledupar) and 31 at 60% (Risaralda). Unlike other studies, the aerosol optical depth values increased up to 59% during the months of lockdown compared to previous years and up to 70% of the weekly mean when compared to before the lockdown. These spatiotemporal behaviors of PM2.5 and the aerosol optical depth in Colombia are influenced by reductions in vehicular flow during quarantine, regional rainfall, and height of the planetary boundary layer. Emissions from economic activities affect pollutant levels in the area. The analysis of the levels of pollutants during the lockdown provides a baseline for regulatory agencies to establish mitigation plans.
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影响因子：
6.9
作者：
Briz-Redon, Alvaro;Belenguer-Sapina, Carolina;Serrano-Aroca, Angel
通讯作者：
Serrano-Aroca, Angel
影响因子：
5.1
作者：
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通讯作者：
Alagha, Omar
影响因子：
8.3
作者：
Lokhandwala, Snehal;Gautam, Pratibha
通讯作者：
Gautam, Pratibha
影响因子：
5
作者：
Christopher, Sundar;Gupta, Pawan
通讯作者：
Gupta, Pawan
影响因子：
9.8
作者：
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通讯作者：
Al-Ansari, Nadhir