Changes in outdoor air pollution due to COVID-19 lockdowns differ by pollutant: evidence from Scotland
Changes in outdoor air pollution due to COVID-19 lockdowns differ by pollutant: evidence from Scotland
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DOI：
10.1136/oemed-2020-106659
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发表时间：
2020-11-01
影响因子：
4.9
通讯作者：
Semple, Sean
中科院分区：
文献类型：
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作者：
Dobson, Ruaraidh;Semple, Sean
目的研究2020年3月/4月COVID-19封锁限制对二氧化氮（NO2）和环境细颗粒物浓度的影响通过与前几年的数据进行比较，苏格兰各地路边监测器测量的空气污染（PM2.5）。方法从苏格兰各地的参考监测系统中提取了31年的公开PM2.5浓度数据紧随于二零二零年三月二十三日实施封城规则后的一天期间。我们收集了2017年、2018年和2019年的类似数据进行比较。根据每小时数据计算平均周期值，并使用成对t检验比较记录值。结果2020年封城期间NO2浓度显著低于前3年（P <0.05），封城期间NO2浓度显著低于前3年（P <0.05），封城期间NO2浓度显著低于前3年（P <0.05），封城期间NO2浓度显著低于前3年（P <0.05），封城期间NO2浓度显著低于前3年（P <0.05）。
ObjectivesTo examine the impact of COVID-19 lockdown restrictions in March/April 2020 on concentrations of nitrogen dioxide (NO2) and ambient fine particulate matter (PM2.5) air pollution measured at roadside monitors across Scotland by comparing data with previous years.MethodsPublicly available data of PM2.5 concentrations from reference monitoring systems at sites across Scotland were extracted for the 31-day period immediately following the imposition of lockdown rules on 23 March 2020. Similar data for 2017, 2018 and 2019 were gathered for comparison. Mean period values were calculated from the hourly data and logged values compared using pairwise t-tests. Weather effects were corrected using meteorological normalisation.ResultsNO2 concentrations were significantly lower in the 2020 lockdown period than in the previous 3 years (p