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 to15 Apr 2026 That day's board

The worst cities for PM2.5 over the 7 days to 15 Apr 2026: Bueng Kan 161.7 µg/m³, Pakxan 161.7 µg/m³ and Chiang Khong 145.3 µg/m³.

  1. 1Bueng KanThailand161.7
  2. 2PakxanLaos161.7
  3. 3Chiang KhongThailand145.3
  4. 4Ban HouakhouaLaos145.3
  5. 5GurugramIndia135.6
  6. 6Mae SaiThailand127.1
  7. 7VientianeLaos115.5
  8. 8MandideepIndia111.4
  9. 9PhayaoThailand107.0
  10. 10NanThailand105.8
  11. 11Chiang RaiThailand102.5
  12. 12SiddharthanagarNepal99.8
  13. 13Charkhi DādriIndia92.8
  14. 14LoniIndia87.8
  15. 15LamphunThailand82.6
  16. 16FaisalabadPakistan81.4
  17. 17PhraeThailand80.7
  18. 18PithampurIndia80.2
  19. 19BawānaIndia80.0
  20. 20MānesarIndia79.2

+ 3,093 more cities, the next at 78.7 µg/m³

Not counted on this day, too few days measured: Nagīna since 4 Apr 2026, Rahim Yar Khan since 26 Mar 2026, Kojomkul since 25 Mar 2026 and Tumkūr since 18 Feb 2026.

30 days7 days
GoodModerateUnhealthy for sensitive 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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.