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 to13 Apr 2026 That day's board

The worst cities for PM2.5 over the 7 days to 13 Apr 2026: Bueng Kan 143.4 µg/m³, Pakxan 143.4 µg/m³ and Chiang Khong 117.1 µg/m³.

  1. 1Bueng KanThailand143.4
  2. 2PakxanLaos143.4
  3. 3Chiang KhongThailand117.1
  4. 4Ban HouakhouaLaos117.1
  5. 5VientianeLaos110.5
  6. 6NanThailand104.6
  7. 7GurugramIndia101.9
  8. 8PhayaoThailand101.5
  9. 9MandideepIndia90.8
  10. 10LamphunThailand89.4
  11. 11Mae SaiThailand88.3
  12. 12PhraeThailand82.5
  13. 13Chiang RaiThailand82.2
  14. 14LampangThailand82.0
  15. 15PithampurIndia81.7
  16. 16HājīpurIndia76.1
  17. 17Chiang MaiThailand74.8
  18. 18SonīpatIndia74.4
  19. 19LoeiThailand73.9
  20. 20SiddharthanagarNepal73.7

+ 3,067 more cities, 73.1 µg/m³ and below

Not counted on this day, too few days measured: Dispur since 12 Apr 2026, Nagīna since 4 Apr 2026, Rahim Yar Khan since 26 Mar 2026 and 2 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.