Table 2.
Daily concentrations of ambient air pollutants and daily-varying covariates
| Variable | Mean (SD) | Median | IQR | Range |
| PM2.5 (µg/m3) | 6.48 (5.28) | 5.21 | 6.24 | 0.02–42.43 |
| NO2 (ppb) | 7.96 (5.78) | 6.70 | 7.69 | 0.01–31.30 |
| O3 (ppb) | 24.60 (7.94) | 24.48 | 10.75 | 3.33–66.18 |
| Temperature (oC) | 2.81 (9.07) | 1.36 | 10.75 | −33.34–28.51 |
| Relative humidity (%) | 73.51 (12.53) | 74.68 | 17.33 | 30.81–99.41 |
| Workplaces mobility change* (%) | −45.1 | −51.0 | 30 | −89–20 |
| Effective reproduction no | 1.04 (0.17) | 1.00 | 0.20 | 0.60–1.90 |
| OxCGRT Government Response Index | 63.14 (12.91) | 67.0 | 11.0 | 3.0–81.0 |
*Daily workplaces mobility per cent change from baseline (vs 3 January 2020 to 6 February 2020).
NO2, nitrogen dioxide; O3, ozone; OxCGRT, Oxford COVID-19 Government Response Tracker; PM2.5, particulate matter with diameter less than 2.5 μm.