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 to26 May 2023 That day's board

The worst cities for PM2.5 over the 7 days to 26 May 2023: Fort Saskatchewan 137.5 µg/m³, Edmonton 115.6 µg/m³ and Fort McMurray 105.9 µg/m³.

  1. 1Fort SaskatchewanCanada137.5
  2. 2EdmontonCanada115.6
  3. 3Fort McMurrayCanada105.9
  4. 4BaghdadIraq100.1
  5. 5Grand CentreCanada93.5
  6. 6CoyhaiqueChile87.7
  7. 7BloemfonteinSouth Africa86.1
  8. 8Grande PrairieCanada85.5
  9. 9St. AlbertCanada82.8
  10. 10LahorePakistan77.6
  11. 11Red DeerCanada76.4
  12. 12EdsonCanada75.3
  13. 13OsornoChile65.4
  14. 14Sherwood ParkCanada61.1
  15. 15Drayton ValleyCanada59.4
  16. 16JakartaIndonesia58.9
  17. 17DhakaBangladesh57.8
  18. 18Puerto VarasChile57.3
  19. 19HyderabadIndia56.0
  20. 20Fort St. JohnCanada55.0

+ 1,830 more cities, 53.6 µg/m³ and below

Not counted on this day, too few days measured: Kampala since 24 May 2023, Ubon Ratchathani since 24 May 2023, Mukdahan since 24 May 2023 and 16 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.