2 shows, in both cases, a clear trend of decline.
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Short-term associations of air pollution and meteorological variables on the incidence and severity of COVID-19 in Madrid (Spain): a time series study.
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The sentences
The relationship with air pollution variables The time evolution of the concentrations of the pollutants analyzed, PM 10 and NO 2 , clearly showed a trend of decline, which could be explained by the restrictions on mobility that took place in Madrid after the declaration of the state of alarm on March 14.