Table 1.
Variations (%) of median values for NMHC/NOx ratios and the concentrations of O3 (μg m−3), NMHC (ppmC) and NOx (μg m−3) during the partial lockdown (03/23/2020–04/05/2020) and relaxed lockdown (04/06/2020–04/16/2020) relative to the period before the partial lockdown (03/01/2020–03/22/2020).
| Partial lockdown | Relaxed lockdown | |
|---|---|---|
| Irajá monitoring station | ||
| NMHC/NOx | +37.3 | +18.5 |
| O3 (μg m−3) | +12.9 | +1.8 |
| NMHC (ppmC) | −25.0 | −12.5 |
| NOx (μg m−3) | −46.1 | −9.2 |
| Bangu monitoring station | ||
| NMHC/NOx | +5.21 | −3.0 |
| O3 (μg m−3) | +6.3 | +0.1 |
| NMHC (ppmC) | −14.3 | 0 |
| NOx (μg m−3) | −24.4 | −13.8 |