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 to31 Aug 2026 That day's board

The worst cities for PM2.5 over the 30 days to 31 Aug 2026: Coyhaique 109.8 µg/m³, Palembang 82.8 µg/m³ and Kinshasa 71.9 µg/m³.

  1. 1CoyhaiqueChile109.8
  2. 2PalembangIndonesia82.8
  3. 3KinshasaDemocratic Republic of the Congo71.9
  4. 4Charkhi DādriIndia66.7
  5. 5KampalaUganda64.8
  6. 6OsornoChile64.0
  7. 7PāliIndia60.3
  8. 8GummidipundiIndia59.7
  9. 9GurugramIndia58.7
  10. 10LilongweMalawi57.3
  11. 11DispurIndia56.7
  12. 12Puerto VarasChile56.6
  13. 13NacimientoChile55.3
  14. 14GujranwalaPakistan55.1
  15. 15HualpénChile55.1
  16. 16KarongaMalawi52.8
  17. 17GobindgarhIndia52.3
  18. 18LajaChile51.1
  19. 19ValdiviaChile50.6
  20. 20PrinevilleUnited States49.8

+ 3,011 more cities, 49.3 µg/m³ and below

Not counted on this day, too few days measured: Bawāna since 28 Aug 2026, Rājgīr since 5 Aug 2026, Ropar since 3 Aug 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.