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 to28 Mar 2025 That day's board

The worst cities for PM2.5 over the 7 days to 28 Mar 2025: Loni 257.2 µg/m³, Dispur 161.3 µg/m³ and Vientiane 130.6 µg/m³.

  1. 1LoniIndia257.2
  2. 2DispurIndia161.3
  3. 3VientianeLaos130.6
  4. 4BawānaIndia126.4
  5. 5NarelaIndia126.2
  6. 6NalbāriIndia119.9
  7. 7AndongSouth Korea115.5
  8. 8NanThailand111.9
  9. 9HājīpurIndia111.5
  10. 10GuwahatiIndia111.4
  11. 11Cheongsong gunSouth Korea110.8
  12. 12Kahi KuchiIndia110.7
  13. 13GhāziābādIndia110.5
  14. 14PhraeThailand97.7
  15. 15Ubon RatchathaniThailand96.7
  16. 16YecheonSouth Korea96.1
  17. 17LoeiThailand95.9
  18. 18GurugramIndia95.3
  19. 19Dera MāndiIndia94.8
  20. 20AurangābādIndia93.5

+ 2,964 more cities, 93.3 µg/m³ and below

Not counted on this day, too few days measured: Charkhi Dādri since 28 Mar 2025, Bāghpat since 28 Mar 2025, Bueng Kan since 28 Mar 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.