Table 1.
Columnar NO2 concentration over India before and during lockdown period.
| Time period (1 March 2020–18 April 2020) | Columnar NO2 concentration×1013 (molecule cm−2) | Percentage reduction during the lockdown period from average columnar NO2 concentration before lockdown |
|---|---|---|
|
Before Lockdown | ||
| Before Lockdown Week-1 | 215.7 ± 128.5 | |
| Before Lockdown Week-2 | 194.9 ± 136.2 | |
| Before Lockdown Week-3 |
236.2 ± 178.9 |
|
|
During lockdown | ||
| During lockdown Week-1 | 188.2 ± 119.5 | 12.7 % |
| During lockdown Week-2 | 186.0 ± 118.4 | 13.7 % |
| During lockdown Week-3 | 181.4 ± 108.5 | 15.9 % |
| During lockdown Week-4 | 202.5 ± 119.8 | 6.1 % |