Table 2.
Mean (mean ± SE) concentrations of pollutants during COVID-19 lockdown.
| CO | PM10 | SO2 | NO2 | O3 | |
|---|---|---|---|---|---|
| Makkah | 705.27 ± 10.37bc | 114.37 ± 10.37abcd | 18.83 ± 1.05a | 8.50 ± 2.43c | 34.63 ± 0.64e |
| Ha'il | 528.70 ± 15.46c | 81.57 ± 1.13cd | 5.80 ± 0.29ef | 17.10 ± 0.85b | 67.10 ± 1.01c |
| Jeddah | 654.47 ± 14.12c | 98.10 ± 23.60bcd | 7.53 ± 1.74de | 31.63 ± 2.83a | 46.37 ± 3.25d |
| Jazan | 1176.33 ± 33.26ab | 25.73 ± 2.18f | 13.13 ± 0.34b | 8.40 ± 1.14c | 21.87 ± 2.95fg |
| Tabuk | 731.43 ± 21.20bc | 73.07 ± 11.10d | 9.10 ± 0.06cd | 7.20 ± 1.10c | 110.57 ± 1.27a |
| Al Madinah | 783.17 ± 75.90bc | 125.03 ± 13.18abc | 10.40 ± 0.35c | 39.60 ± 5.81a | 20.43 ± 2.92g |
| Al Qasim | 957.27 ± 180.79bc | 160.50 ± 20.36a | 5.90 ± 0.06ef | 5.70 ± 0.26c | 49.23 ± 3.76d |
| Riyadh | 1557.87 ± 218.75a | 24.10 ± 4.78f | 5.07 ± 0.20f | 29.10 ± 8.55a | 28.27 ± 1.36ef |
| Haql | 702.93 ± 70.00bc | 130.93 ± 23.36ab | 8.40 ± 0.12cd | 13.13 ± 1.64b | 82.40 ± 0.89b |
| F value | 4.806 | 9.981 | 37.995 | 11.101 | 174.434 |
| P value | 0.003 | 0.000 | 0.000 | 0.000 | 0.000 |
Mean±S.E with different superscripts (a-g) along the same column were significantly different (p < 0.05).