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  • Changes in air quality during the lockdown in Barcelona (Spain) one month into the SARS-CoV-2 epidemic #MMPMID32302810
  • Tobias A; Carnerero C; Reche C; Massague J; Via M; Minguillon MC; Alastuey A; Querol X
  • Sci Total Environ 2020[Jul]; 726 (ä): 138540 PMID32302810show ga
  • Lockdown measures came into force in Spain from March 14th, two weeks after the start of the SARS-CoV-2 epidemic, to reduce the epidemic curve. Our study aims to describe changes in air pollution levels during the lockdown measures in the city of Barcelona (NE Spain), by studying the time evolution of atmospheric pollutants recorded at the urban background and traffic air quality monitoring stations. After two weeks of lockdown, urban air pollution markedly decreased but with substantial differences among pollutants. The most significant reduction was estimated for BC and NO2 (-45 to -51%), pollutants mainly related to traffic emissions. A lower reduction was observed for PM10 (-28 to -31.0%). By contrast, O3 levels increased (+33 to +57% of the 8h daily maxima), probably due to lower titration of O3 by NO and the decrease of NOx in a VOC-limited environment. Relevant differences in the meteorology of these two periods were also evidenced. The low reduction for PM10 is probably related to a significant regional contribution and the prevailing secondary origin of fine aerosols, but an in-depth evaluation has to be carried out to interpret this lower decrease. There is no defined trend for the low SO2 levels, probably due to the preferential reduction in emissions from the least polluting ships. A reduction of most pollutants to minimal concentrations are expected for the forthcoming weeks because of the more restrictive actions implemented for a total lockdown, which entered into force on March 30th. There are still open questions on why PM10 levels were much less reduced than BC and NO2 and on what is the proportion of the abatement of pollution directly related to the lockdown, without meteorological interferences.
  • |*Air Pollution[MESH]
  • |*Betacoronavirus[MESH]
  • |*Coronavirus Infections[MESH]
  • |*Pandemics[MESH]
  • |*Pneumonia, Viral[MESH]
  • |Air Pollutants[MESH]
  • |COVID-19[MESH]
  • |Environmental Monitoring[MESH]
  • |Particulate Matter[MESH]
  • |SARS-CoV-2[MESH]
  • |Spain[MESH]

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  • suck abstract from ncbi

    138540 ä.726 2020