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 to22 Apr 2025 That day's board

The worst cities for PM2.5 over the 30 days to 22 Apr 2025: Loni 158.7 µg/m³, Dādri 107.8 µg/m³ and Bawāna 103.4 µg/m³.

  1. 1LoniIndia158.7
  2. 2DādriIndia107.8
  3. 3BawānaIndia103.4
  4. 4NarelaIndia94.3
  5. 5HājīpurIndia91.3
  6. 6AurangābādIndia84.6
  7. 7GhāziābādIndia84.0
  8. 8SasarāmIndia83.7
  9. 9RourkelaIndia81.9
  10. 10Kahi KuchiIndia78.4
  11. 11Dera MāndiIndia77.1
  12. 12SiltaraIndia76.3
  13. 13SingrauliIndia75.8
  14. 14GuwahatiIndia74.6
  15. 15DelhiIndia71.8
  16. 16Mae SaiThailand69.4
  17. 17PāliIndia68.7
  18. 18Ubon RatchathaniThailand68.4
  19. 19LucknowIndia67.5
  20. 20Chiang KhongThailand65.8

+ 3,059 more cities, 65.8 µg/m³ and below

Not counted on this day, too few days measured: Chānda since 22 Apr 2025, Siliguri since 20 Apr 2025, Begusarai since 16 Apr 2025 and 12 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.