Table 1.
Main air pollutants concentrations and air quality index for Madrid region during the five time periods (COVID-19 pre-lockdown, COVID-19 beyond lockdown during first wave, COVID-19 under heat wave, COVID-19 under second wave, and COVID-19 under third wave).
| Time period | 1 January –15 February 2020-pre-lockdown | 15 February -15 June 2020 during the 1-st COVID-19 wave and beyond lockdown | 15 June- 10 August 2020 under heat wave | 10 August – 30 November 2020, during the 2-nd COVID-19 wave | 1 December 2020-28 February 2021, during the 3-rd COVID-19 wave | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Daily average | Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range |
| PM2.5 (μg/m3) | 28.64 ± 12.24 | 10-52 | 20.43 ± 10.57 | 8-65 | 28.15 ± 9.87 | 8-50 | 23.06 ± 8.29 | 9-57 | 21.92 ± 15.31 | 6-72 |
| PM10 (μg/m3) | 71.44 ± 23.44 | 32-126 | 51.70 ± 17.28 | 23-109 | 64.11 ± 15.09 | 33-96 | 54.64 ± 15.06 | 23-90 | 52.08 ± 29.00 | 15-147 |
| O3 (μg/m3) | 15.54 ± 7.56 | 1-30 | 31.89 ± 7.03 | 13-51 | 46.25 ± 13.17 | 23-109 | 29.53 ± 11.71 | 7-64 | 22.41 ± 6.98 | 2-33 |
| NO2 (μg/m3) | 28.07 ± 10.03 | 14-62 | 13.07 ± 8.62 | 2-43 | 15.92 ± 6.36 | 6-42 | 21.32 ± 8.48 | 4-40 | 22.22 ± 13.44 | 5-72 |
| AQI | 30.39 ± 10.48 | 16-62 | 30.56 ± 6-59 | 16-50 | 34.02 ± 5.06 | 22-50 | 27.25 ± 7.02 | 12-50 | 25.89 ± 8.03 | 13-62 |