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 to6 Sep 2025 That day's board

The worst cities for PM2.5 over the 30 days to 6 Sep 2025: Coyhaique 80.5 µg/m³, Kigali 65.1 µg/m³ and Nacimiento 61.7 µg/m³.

  1. 1CoyhaiqueChile80.5
  2. 2KigaliRwanda65.1
  3. 3NacimientoChile61.7
  4. 4GummidipundiIndia60.2
  5. 5CuddaloreIndia59.2
  6. 6FaisalabadPakistan58.7
  7. 7Puerto VarasChile58.3
  8. 8RānipetIndia57.0
  9. 9OsornoChile54.5
  10. 10DhaulpurIndia52.6
  11. 11SamāstipurIndia52.5
  12. 12Sri GanganagarIndia51.9
  13. 13JhānsiIndia49.3
  14. 14DushanbeTajikistan47.8
  15. 15Santa MaríaPeru45.3
  16. 16GujranwalaPakistan45.1
  17. 17AurangābādIndia44.9
  18. 18ValdiviaChile44.3
  19. 19PonferradaSpain44.2
  20. 20San CarlosChile43.9

+ 2,956 more cities, 43.8 µg/m³ and below

Not counted on this day, too few days measured: Nagapattinam since 2 Sep 2025, Manama since 28 Aug 2025, Flin Flon since 23 Aug 2025 and Dispur since 19 Jul 2025.

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.