Impact of COVID-19 Event on the Air Quality in Iran
Impact of COVID-19 Event on the Air Quality in Iran
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DOI：
10.4209/aaqr.2020.05.0205
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发表时间：
2020-08-01
影响因子：
4
通讯作者：
Kim, Jong Ryeol
中科院分区：
文献类型：
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作者：
Broomandi, Parya;Karaca, Ferhat;Kim, Jong Ryeol
2020年2月中旬，伊朗确诊首例新型冠状病毒病例。随后实施封锁以应对这种传染病。本研究旨在研究COVID-19封锁对伊朗空气质量的潜在影响。于2019年及2020年3月21日至4月21日期间，我们从12个空气质素监测站收集数据，分析六项标准污染物，即O-3、NO2、SO2、CO、PM10及PM2. 5。由于缺乏地面测量，使用卫星数据使我们能够在对伊朗特大城市，特别是德黑兰进行研究期间评估空气质量的变化，即，伊朗的首都。主要污染物（SO_25 - 28%，NO_21 - 33%，CO 5- 41%，PM_101.4 - 30%）浓度随空间变化呈下降趋势。尽管如此，SO2、NO2和PM10仍分别超过世界卫生组织每日限制水平31天、31天和4天。相反，O-3和PM2.5增加了0.5-103%和2- 50%。就全国空气质量而言，SO2及NO2水平于封城期间下降，而AOD则上升。不利的气象条件阻碍了污染物的扩散。此外，在封锁期间，行星边界层的高度和降雨量都有所减少。尽管天气条件不利，但主要污染物水平的下降证实了伊朗空气质量的可能改善。
The first novel coronavirus case was confirmed in Iran in mid-February 2020. This followed by the enforcement of lockdown to tackle this contagious disease. This study aims to examine the potential effects of the COVID-19 lockdown on air quality in Iran. From 21st March to 21st April in 2019 and 2020, The Data were gathered from 12 air quality stations to analyse six criteria pollutants, namely O-3, NO2, SO2, CO, PM10, and PM2.5. Due to the lack of ground-level measurements, using satellite data equipped us to assess changes in air quality during the study on Iranian megacities, especially in Tehran, i.e., the capital of Iran. In this city, concentrations of primary pollutants (SO2 5-28%, NO2 1-33%, CO 5-41%, PM10 1.4- 30%) decreased with spatial variations. Although, still SO2, NO2, and PM10 exceeded the WHO daily limit levels for 31 days, 31 days, and four days, respectively. Conversely, O-3 and PM2.5 increased by 0.5-103% and 2-50%. In terms of the national air quality, SO2 and NO2 levels decreased while AOD increased during the lockdown. Unfavourable meteorological conditions hindered pollutant dispersion. Moreover, reductions in the height of planetary boundary layer and rainfall were observed during the lockdown period. Despite the adverse weather conditions, a decrease in primary pollutant levels, confirms the possible improvements on the air quality in Iran.