Table 3.
Descriptive analysis of PM2.5 concentrations (24 h) for Lahore, Karachi, Islamabad and Karachi during community interventions.
| Community interventions | Lahore | Karachi | Peshawar | Islamabad |
|---|---|---|---|---|
| Pre-lock down (PL) | January 1 to March 22, 2020 | January 1 to March 22, 2020 | January 1 to April 2, 2020 | January 1 to March 22, 2020 |
| Maximum | 375.0 | 213.0 | 425.0 | 236.0 |
| Minimum | 31.0 | 81.0 | 62.0 | 58.0 |
| Average | 176.0 | 142.5 | 148.9 | 131.7 |
| Standard deviation | 84.7 | 31.8 | 52.6 | 34.9 |
| Lock down (L) | March 22 to May 9, 2020 | March 22 to May 30 | April 2 to May 9, 2020 | March 22 to May 9, 2020 |
| Maximum | 215.0 | 140.0 | 130.0 | 119.0 |
| Minimum | 51.0 | 50.0 | 58.0 | 58.0 |
| Average | 108.9 | 78.0 | 97.2 | 83.0 |
| Standard deviation | 33.5 | 16.2 | 19.0 | 12.5 |
| Relaxation period (RL) | May 10 to June 16, 2020 | June 1 to June 17, 2020 | May 10 to June 16, 2020 | May 10 to June 17, 2020 |
| Maximum | 199.0 | 98.0 | 137.0 | 105.0 |
| Minimum | 92.0 | 59.0 | 58.0 | 65.0 |
| Average | 133.5 | 77.7 | 101.7 | 82.6 |
| Standard deviation | 27.5 | 11.0 | 19.1 | 9.4 |
| Smart lockdown (SL) | June 17 to June 30 | June 18 to June 30 | June 17 to June 30 | June 18 to June 30 |
| Maximum | 157.0 | 84.0 | 163.0 | 146.0 |
| Minimum | 88.0 | 49.0 | 106.0 | 82.0 |
| Average | 134.9 | 65.3 | 126.9 | 103.8 |
| Standard deviation | 21.0 | 11.4 | 47.2 | 16.3 |