COVID-19 pandemic: Impacts on the air quality during the partial lockdown in Sao Paulo state, Brazil
COVID-19 pandemic: Impacts on the air quality during the partial lockdown in Sao Paulo state, Brazil
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DOI：
10.1016/j.scitotenv.2020.139087
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发表时间：
2020-08-15
影响因子：
9.8
通讯作者：
Urban, Rodrigo Custodio
中科院分区：
文献类型：
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作者：
Kondo Nakada, Liane Yuri;Urban, Rodrigo Custodio
2020 年 3 月初，世界卫生组织宣布 COVID-19 为大流行病，2020 年 3 月下旬，圣保罗州政府下令部分封锁。本研究的目的是评估因 COVID-19 大流行而实施的部分封锁期间对巴西圣保罗空气质量的影响，以提供所需的社交距离。我们分析了巴西圣保罗四个空气质量站的数据，以评估部分封锁期间空气污染物浓度的变化。将数据与五年的月度平均值以及部分封锁前的四周进行了比较。总体而言，与五年月平均值相比，部分封锁期间城市地区的 NO（高达 -77.3%）、NO2（高达 -54.3%）和 CO（高达 -64.8%）浓度大幅下降。相比之下，在受车辆交通影响较大的城市地区，臭氧浓度增加了约 30%，这可能与一氧化氮的减少有关。尽管部分封锁对空气质量产生了积极影响，但重要的是要考虑到对社会方面的负面影响，考虑到 COVID-19 造成的死亡以及巨大的经济影响。 (C) 2020 Elsevier B.V. 保留所有权利。
In early March 2020, the World Health Organization declared the COVID-19 as a pandemic, and in late March 2020 partial lockdown was ordered by the Sao Paulo state government. The aim of this study was to assess impacts on air quality in Sao Paulo - Brazil, during the partial lockdown implemented to provide social distancing required due to the COVID-19 pandemic. We have analyzed data from four air quality stations in Sao Paulo, Brazil to assess air pollutant concentration variations during the partial lockdown. Data were compared to the five-year monthly mean and to the four-week before the partial lockdown. Overall, drastic reductions on NO (up to -77.3%), NO2 (up to -54.3%), and CO (up to -64.8%) concentrations were observed in the urban area during partial lockdown compared to the five-year monthly mean. By contrast, an increase of approximately 30% in ozone concentrations was observed in urban areas highly influenced by vehicle traffic, probably related to nitrogen monoxide decreases. Although the partial lockdown has contributed to a positive impact on air quality, it is important to take into account the negative impacts on social aspects, considering the deaths caused by COVID-19 and also the dramatic economic effects. (C) 2020 Elsevier B.V. All rights reserved.