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 to30 Mar 2025 That day's board

The worst cities for PM2.5 over the 30 days to 30 Mar 2025: Loni 170.9 µg/m³, Dhaka 118.5 µg/m³ and Hājīpur 105.6 µg/m³.

  1. 1LoniIndia170.9
  2. 2DhakaBangladesh118.5
  3. 3HājīpurIndia105.6
  4. 4BawānaIndia105.5
  5. 5N'DjamenaChad103.0
  6. 6KampalaUganda102.3
  7. 7AngulIndia92.2
  8. 8Kahi KuchiIndia91.0
  9. 9NarelaIndia87.8
  10. 10SiltaraIndia87.2
  11. 11Dera MāndiIndia86.5
  12. 12GhāziābādIndia85.7
  13. 13GuwahatiIndia85.2
  14. 14JājangIndia79.7
  15. 15RourkelaIndia79.4
  16. 16KathmanduNepal79.2
  17. 17Charkhi DādriIndia78.6
  18. 18VientianeLaos77.7
  19. 19SasarāmIndia76.1
  20. 20NanThailand75.3

+ 2,943 more cities, 73.4 µg/m³ and below

Not counted on this day, too few days measured: Dera Colliery Township since 25 Mar 2025, Vapi since 24 Mar 2025, Abuja since 13 Mar 2025 and 4 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.