Table 2.
Comparison of NO2 concentrations over India before and during lockdown with previous year concentrations.
| Time period (1 March 2020–18 April 2020) | Columnar NO2 concentration×1013 (molecule cm−2) |
Columnar NO2 compared to 2019 (increase/decrease) % | |
|---|---|---|---|
| 2020 | 2019 | ||
| Week-1 | 215.7 ± 128.5 | 198.4 ± 141.9 | +8.8 |
| Week-2 | 194.9 ± 136.2 | 224.9 ± 151.5 | -13.4 |
| Week-3 | 236.2 ± 178.9 | 247.8 ± 168.7 | -4.7 |
| Week-4 | 188.2 ± 119.5 | 228.6 ± 161.9 | -17.6 |
| Week-5 | 186.0 ± 118.4 | 245.3 ± 163.5 | -24.2 |
| Week-6 | 181.4 ± 108.5 | 209.5 ± 121.2 | -13.4 |
| Week-7 | 202.5 ± 119.8 | 219.0 ± 125.2 | -7.5 |