12. Kathmandu, Nepal
> Air quality ranking April 8, 2022: 139, 12 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 50.9
> Worst month in 2021: March (108.6)
> Avg. annual PM2.5 concentration in 2020: 39.2
> Total population in 2022: 1,521,057
11. Wuhan, China
> Air quality ranking April 8, 2022: 143, 11 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 46.7
> Worst month in 2021: December (85.9)
> Avg. annual PM2.5 concentration in 2020: 36.5
> Total population in 2022: 8,591,611
10. Chengdu, China
> Air quality ranking April 8, 2022: 145, 10 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 40.3
> Worst month in 2021: January (75.5)
> Avg. annual PM2.5 concentration in 2020: 40.5
> Total population in 2022: 9,478,521
9. Shenyang, China
> Air quality ranking April 8, 2022: 145, 9 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 37.0
> Worst month in 2021: March (67.6)
> Avg. annual PM2.5 concentration in 2020: 40.8
> Total population in 2022: 7,527,975
8. Riyadh, Saudi Arabia
> Air quality ranking April 8, 2022: 149, 8 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 32.5
> Worst month in 2021: October (45.6)
> Avg. annual PM2.5 concentration in 2020: 23.3
> Total population in 2022: 7,538,200
