Table 1.
Mean concentrations of PM10, SO2, NO2 and averaged meteorological parameters observed in Salé city between March 11th to 20th (before the lockdown) and March 21st to April 2nd (during the lockdown).
| Air pollutant/meteorological parameter | Before lockdown | During lockdown | Difference [variation in %] |
|---|---|---|---|
| PM10 (μg/m3) | 114.6 | 28.3 | −86.3 [−75] |
| NO2 (μg/m3) | 5.6 | 0.2 | −5.4 [−96] |
| SO2 (μg/m3) | 6.6 | 3.3 | −3.2 [−49] |
| Temperature (°C) | 14.5 | 14.2 | −0.3 [−2] |
| Precipitation (mm) | 0.0 | 0.1 | 0.1 [+88] |
| Wind speed (m/s) | 6.0 | 7.9 | 1.9 [+24] |
| Relative humidity (%) | 79.5 | 81.4 | 1.9 [+2] |