Table 2.
Variations (%) of PM10 (μg m−3), NO2 (μg m−3), O3 (μg m−3) and CO (ppm) concentrations during the lockdown, relative to March 2–15, 2020 (first and second weeks), third (03/16–03/22), fourth (03/23–03/29), fifth (03/30–05/04) and sixth (05/04–12/04) weeks.
| Station | Third week (03/16–03/22), partial restrictions | Fourth week (03/23–03/29), lockdown | Fifth week (03/30–05/04), lockdown | Sixth week (05/04–12/04), lockdown |
|---|---|---|---|---|
| PM10 | ||||
| Bangu | −15.0 | −17.5 | 2.5 | 7.5 |
| Irajá | 10.7 | −21.4 | 3.6 | 3.6 |
| Tijuca | 11.0 | −33.3 | 2.1 | 25.5 |
| NO2 | ||||
| Bangu | −1.8 | −32.2 | −32.1 | −16.8 |
| Irajá | 28.8 | −53.9 | −19.7 | 1.4 |
| O3 | ||||
| Bangu | 33.5 | −2.7 | 17.0 | −7.8 |
| Irajá | 31.1 | 12.9 | 23.7 | −2.7 |
| Tijuca | 63 | 44.0 | 67.1 | 34.0 |
| CO | ||||
| Bangu | −15.2 | −41.3 | −30.4 | −42.4 |
| Tijuca | 12 | −48.5 | −30.3 | −30.3 |