Table 3.
Reduction in PM2.5 (μg/m3) and NO2 (1E15 molecules/cm2) levels in 2020 as compared to 2-years average values. Absolute differences (μg/m3 for PM2.5 and 1E15 molecules/cm2 for NO2) and relative changes (%) of PM2.5 and NO2 concentrations at before, during, and post lockdown periods (depending on each city lockdown dates). n.a.: Not Available.
| City, Country | Pre lockdown | During lockdown | Post lockdown | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ave. | Diff. | Change | Ave. | Diff. | Change | Ave. | Diff. | Change | ||||||||||
| PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | PM2.5 | NO2 | |
| Algiers, Algeria | 24.13 | 2.67 | 0.23 | 0.11 | 1% | 4% | 17.60 | 1.74 | -2.17 | -0.38 | -11% | -18% | 19.53 | 1.76 | -5.25 | -0.31 | -21% | -15% |
| Addis Ababa, Ethiopia | 22.60 | n.a. | -0.87 | n.a. | -4% | n.a. | 22.73 | 0.61 | -6.24 | 0.00 | -22% | 0% | 38.05 | 0.79 | -6.74 | 0.07 | -15% | 9% |
| Kampala, Uganda | 67.42 | 0.58 | 5.63 | -0.06 | 9% | -9% | 36.94 | 0.07 | -3.82 | -0.02 | -9% | -3% | 56.05 | 0.70 | -5.01 | -0.03 | -8% | -3% |
| Conakry, Guinea | n.a. | 0.74 | n.a. | 0.02 | n.a. | 3% | 15.18 | 0.56 | n.a. | 0.01 | n.a. | 3% | 11.03 | 0.91 | n.a. | 0.00 | n.a. | 1% |
| Khartoum, Sudan | n.a. | 0.87 | n.a. | -0.10 | n.a. | -10% | 53.68 | 1.02 | n.a. | -0.21 | n.a. | -17% | 57.90 | 1.08 | n.a. | -0.24 | n.a. | -18% |
| Abidjan, Côte d'Ivoire | n.a. | 0.59 | n.a. | 0.04 | n.a. | 7% | 18.35 | 0.53 | n.a. | 0.01 | n.a. | 1% | 22.21 | 0.43 | n.a. | 0.07 | n.a. | 19% |
| Abu Dhabi, United Arab Emirates | 19.92 | 3.70 | -21.08 | 0.51 | -51% | 16% | 21.77 | 2.66 | -23.19 | -0.49 | -52% | -16% | 26.94 | 2.39 | -24.03 | -0.37 | -47% | -14% |
| Kuwait City, Kuwait | 45.54 | 6.25 | 3.04 | 0.31 | 7% | 5% | 35.05 | 4.45 | -10.89 | -0.21 | -24% | -4% | 41.45 | 5.49 | -14.76 | 0.71 | -26% | 15% |
| Baghdad, Iraq | 49.83 | 5.16 | 16.32 | 0.51 | 49% | 11% | 39.83 | 2.83 | 11.03 | -0.38 | 38% | -12% | 78.07 | 3.77 | 42.31 | 0.24 | 54% | 7% |
| Manama, Bahrain | 42.41 | n.a. | -5.15 | n.a. | -11% | n.a. | 42.00 | n.a. | -4.29 | n.a. | -9% | n.a. | 41.60 | n.a. | -9.34 | n.a. | -18% | n.a. |
| Dhaka, Bangladesh | 151.43 | 7.08 | -5.78 | -0.02 | -4% | 0% | 51.25 | 2.85 | -3.94 | -1.08 | -7% | -27% | 29.45 | 1.98 | -1.16 | -0.73 | -4% | -27% |
| Chengdu, China | 61.69 | 6.15 | -30.17 | -2.22 | -33% | -27% | 48.75 | 6.18 | -17.32 | 0.55 | -26% | 10% | 58.19 | 5.65 | 12.92 | 0.91 | 29% | 19% |
| Beijing, China | 56.71 | 13.36 | -27.03 | -3.46 | -32% | -21% | 49.02 | 10.61 | -16.42 | -2.85 | -25% | -21% | 39.31 | 9.49 | -7.92 | -2.24 | -17% | -19% |
| New Delhi, India | 115.29 | 5.49 | -15.95 | -0.09 | -12% | -2% | 44.26 | 3.48 | -27.09 | -1.58 | -38% | -31% | n.a. | 3.49 | n.a. | -0.36 | n.a. | -9% |
| Kolkata, India | 121.30 | 4.30 | -15.25 | -0.09 | -11% | -2% | 21.69 | 2.36 | -15.32 | -0.49 | -41% | -17% | n.a. | 2.12 | n.a. | 0.18 | n.a. | 9% |
| Jakarta, Indonesia | 41.09 | 1.62 | 15.65 | -0.22 | 62% | -12% | 48.78 | 1.61 | 8.62 | -0.79 | 21% | -33% | 63.84 | 2.20 | 19.00 | -0.46 | 42% | -17% |
| Ulaanbaatar, Mongolia | 131.11 | 0.99 | -14.12 | 0.07 | -10% | 8% | 20.32 | 0.94 | -6.90 | -0.05 | -25% | -5% | n.a. | 1.33 | 0.04 | n.a. | 3% | |
| Kathmandu, Nepal | 66.15 | 1.59 | -19.67 | -0.39 | -23% | -20% | 31.56 | 1.98 | -27.43 | -0.51 | -46% | -20% | 9.32 | 1.35 | -21.76 | -0.27 | -70% | -16% |
| Islamabad, Pakistan | n.a. | 3.13 | n.a. | -0.36 | n.a. | -10% | 25.39 | 2.12 | n.a. | -0.66 | -60% | -24% | 30.32 | 2.67 | -0.17 | -0.60 | -1% | -18% |
| Bogotá, Colombia | 15.55 | 1.22 | -2.91 | 0.19 | -16% | 19% | 12.22 | 0.74 | -1.36 | -0.19 | -10% | -20% | n.a. | 0.71 | n.a. | -0.24 | n.a. | -25% |
| Lima, Peru | 18.74 | 1.33 | -5.21 | 0.17 | -22% | 14% | 17.34 | 0.96 | -15.06 | -1.29 | -46% | -58% | n.a. | 2.02 | n.a. | -0.47 | n.a. | -19% |