7. Bangkok, Thailand
> Air quality ranking April 8, 2022: 155, 7 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 20.0
> Worst month in 2021: February (45.2)
> Avg. annual PM2.5 concentration in 2020: 20.6
> Total population in 2022: 10,899,698
6. Delhi, India
> Air quality ranking April 8, 2022: 156, 6 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 96.4
> Worst month in 2021: November (224.1)
> Avg. annual PM2.5 concentration in 2020: 84.1
> Total population in 2022: 32,065,760
5. Chiang Mai, Thailand
> Air quality ranking April 8, 2022: 163, 5 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 24.9
> Worst month in 2021: March (83.2)
> Avg. annual PM2.5 concentration in 2020: 30.5
> Total population in 2022: 1,197,931
4. Hanoi, Vietnam
> Air quality ranking April 8, 2022: 171, 4 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 36.2
> Worst month in 2021: December (74.7)
> Avg. annual PM2.5 concentration in 2020: 37.9
> Total population in 2022: 5,067,352
3. Lahore, Pakistan
> Air quality ranking April 8, 2022: 173, 3 worst among 95 major cities
> Avg. annual PM2.5 concentration (μg/m³) in 2021: 86.5
> Worst month in 2021: December (212.1)
> Avg. annual PM2.5 concentration in 2020: 79.2
> Total population in 2022: 13,541,764
