SmogRank / History / City race
Cities, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities for PM2.5 over the 30 days to 20 Apr 2025: Loni 170.3 µg/m³, Dādri 108.2 µg/m³ and Bawāna 104.9 µg/m³.
- 1LoniIndia170.3
- 2DādriIndia108.2
- 3BawānaIndia104.9
- 4NarelaIndia95.6
- 5HājīpurIndia88.5
- 6GhāziābādIndia85.6
- 7AurangābādIndia83.5
- 8Kahi KuchiIndia82.9
- 9GuwahatiIndia82.0
- 10SasarāmIndia80.3
- 11RourkelaIndia78.6
- 12Dera MāndiIndia76.4
- 13SiltaraIndia74.2
- 14DelhiIndia71.6
- 15Mae SaiThailand70.9
- 16SingrauliIndia69.6
- 17ChāndaIndia69.1
- 18VientianeLaos67.7
- 19PāliIndia67.4
- 20NanThailand66.8
+ 3,131 more cities, the next at 66.6 µg/m³
Not counted on this day, too few days measured: Siliguri since 20 Apr 2025, Begusarai since 16 Apr 2025, Purnia since 15 Apr 2025 and 12 more cities.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.