Impact of Covid-19 lockdown on PM10, SO2 and NO2 concentrations in Salé City (Morocco)
Fecha
2020Autor
Otmani, Anas
Benchrif, Abdelfettah
Tahri, Mounia
Bounakhla, Moussa
Chakir, El Mahjoub
El Bouch, Mohammed
Krombi, M'hamed
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Resumen
Covid-19 was first reported in Morocco on March 2, 2020. Since then, to prevent its propagation, the Moroccan government declared a state of health emergency. A set of rapid and strict countermeasures have taken, including locking
down cities, limiting population's mobility and prohibiting almost all avoidable activities. In the present study, we
attempted to evaluate the changes in levels of some air pollutants (mainly PM10, NO2 and SO2) in Salé city (North-Western Morocco) during the lockdown measures. In this context, a continuous measurement of PM10, SO2 and NO2 was
carried before and during the Covid-19 lockdown period. As a consequence of the security measures and control actions
undertaken, the emissions from vehicle exhaust and industrial production were significantly reduced, which contribute
to the decrease in the concentrations of the studied pollutants. The obtained results showed that the difference between
the concentrations recorded before and during the lockdown period were respectively 75%, 49% and 96% for PM10, SO2
and NO2. PM10 levels were much less reduced than NO2. The three-dimensional air mass backward trajectories, using
the HYSPLIT model, demonstrated the benefits of PM10 local emission reductions related to the lockdown were
overwhelmed by the contribution of long-range transported aerosols outside areas. In addition, noteworthy differences
in the air mass back trajectories and the meteorology between these two periods were evidenced.
Palabras clave
Covid-19; PM10; NO2; SO2; Lockdown; MoroccoEnlace al recurso
https://doi.org/10.1016/j.scitotenv.2020.139541Colecciones
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