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On April 20th, 2020, 2,403,410 cases of corona Virus were confirmed globally This date matches the end of the first strict lockdown in Morocco The number of Morocco confirmed cases attended 2990 and 143 deaths were recorded Due to the pandemic, all avoidable activities in the country were prohibited since the kingdom announced the general lockdown on March 20th, 2020 This study aims at comparing the air quality status, before the pandemic and during the confinement It was performed in Casablanca and Marrakech from Morocco The main objective is to show whether COVID-19 compelled lockdown may have saved lives by restraining air pollution than by preventing infection We used the difference-in-difference and the Theil and Sen non-parametric approaches for univariate time series We defined the before quarantine period as between February 16th and March 19th and the during quarantine as between the March 20th and April 20th We assessed changes in air quality during vs before the quarantine period in 2020 and compared these with corresponding changes in the same lunar calendar periods in 2016-2019 Then we calculated the avoided cause-specific mortality attributable to the decreases in NO2 and PM2 5 based on the concentration-response functions from previous studies We found that NO2 dropped by -12 mug/m3 in Casablanca and - 7 mug/m3 in Marrakech PM2 5 dropped by -18 mug/m3 in Casablanca and - 14 mug/m3 in Marrakech CO dropped by -0 04 mg/m3 in Casablanca and - 0 12 mg/m3 in Marrakech This air pollution reduction had created human health benefits It reduced mortality, and saved lives mainly from cardiovascular diseases Further investigation may be undertaken to explore the reduction in the concentrations of industry-related pollutants
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COVID-19 national lockdown in morocco: Impacts on air quality and public health
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