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.

CountriesCities
The 30 days to18 Apr 2025 That day's board

The worst cities for PM2.5 over the 30 days to 18 Apr 2025: Loni 180.3 µg/m³, Bawāna 109.8 µg/m³ and Dādri 109.1 µg/m³.

  1. 1LoniIndia180.3
  2. 2BawānaIndia109.8
  3. 3DādriIndia109.1
  4. 4NarelaIndia97.5
  5. 5Kahi KuchiIndia92.7
  6. 6HājīpurIndia90.3
  7. 7GhāziābādIndia87.3
  8. 8GuwahatiIndia86.5
  9. 9AurangābādIndia82.4
  10. 10Dera MāndiIndia79.0
  11. 11SasarāmIndia78.9
  12. 12RourkelaIndia77.8
  13. 13SiliguriIndia75.2
  14. 14SiltaraIndia72.6
  15. 15DelhiIndia72.1
  16. 16Mae SaiThailand71.1
  17. 17VientianeLaos70.5
  18. 18TiruchirappalliIndia70.0
  19. 19NanThailand68.2
  20. 20SingrauliIndia68.1

+ 3,006 more cities, 66.2 µg/m³ and below

Not counted on this day, too few days measured: Begusarai since 16 Apr 2025, Jājang since 16 Apr 2025, Purnia since 15 Apr 2025 and 13 more cities.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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 and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.