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 to6 May 2026 That day's board

The worst cities for PM2.5 over the 30 days to 6 May 2026: Loni 104.4 µg/m³, Gurugram 103.5 µg/m³ and Chiang Khong 93.6 µg/m³.

  1. 1LoniIndia104.4
  2. 2GurugramIndia103.5
  3. 3Chiang KhongThailand93.6
  4. 4Ban HouakhouaLaos93.6
  5. 5Charkhi DādriIndia88.6
  6. 6SingrauliIndia83.1
  7. 7NarelaIndia82.8
  8. 8NanThailand82.8
  9. 9JīndIndia80.9
  10. 10Bueng KanThailand79.9
  11. 11PakxanLaos79.9
  12. 12NarnaulIndia79.5
  13. 13PhayaoThailand78.5
  14. 14BawānaIndia77.9
  15. 15MānesarIndia77.9
  16. 16Mae SaiThailand74.6
  17. 17MandideepIndia73.9
  18. 18VientianeLaos73.3
  19. 19SonīpatIndia72.0
  20. 20DādriIndia70.8

+ 3,044 more cities, 68.4 µg/m³ and below

Not counted on this day, too few days measured: Dhāruhera since 6 May 2026, Bāghpat since 6 May 2026, Gobindgarh since 6 May 2026 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.