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 7 days to11 Mar 2025 That day's board

The worst cities for PM2.5 over the 7 days to 11 Mar 2025: Loni 188.2 µg/m³, Dhaka 139.9 µg/m³ and Kampala 124.6 µg/m³.

  1. 1LoniIndia188.2
  2. 2DhakaBangladesh139.9
  3. 3KampalaUganda124.6
  4. 4HājīpurIndia124.0
  5. 5BawānaIndia121.1
  6. 6NegotinSerbia117.6
  7. 7AngulIndia111.7
  8. 8GhāziābādIndia105.0
  9. 9ZaječarSerbia102.1
  10. 10N'DjamenaChad101.3
  11. 11BhiwadiIndia100.9
  12. 12Dera MāndiIndia100.3
  13. 13NarelaIndia97.7
  14. 14GuwahatiIndia93.8
  15. 15Kahi KuchiIndia93.8
  16. 16SasarāmIndia92.2
  17. 17KathmanduNepal91.3
  18. 18TumkūrIndia90.9
  19. 19Charkhi DādriIndia89.3
  20. 20GurugramIndia85.8

+ 2,992 more cities, 85.2 µg/m³ and below

Not counted on this day, too few days measured: El Paso since 10 Mar 2025, Koppal since 9 Mar 2025, Beijing since 7 Mar 2025 and 5 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.