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.
The worst cities for PM2.5 over the 30 days to 28 Sep 2023: Dushanbe 61.9 µg/m³, Fort McMurray 57.5 µg/m³ and Peshawar 57.1 µg/m³.
- 1DushanbeTajikistan61.9
- 2Fort McMurrayCanada57.5
- 3PeshawarPakistan57.1
- 4CoyhaiqueChile54.7
- 5DhakaBangladesh52.6
- 6LahorePakistan51.8
- 7Tha BoThailand49.5
- 8Grande PrairieCanada48.3
- 9Puerto VarasChile47.1
- 10OsornoChile47.0
- 11EdmontonCanada46.2
- 12Prince AlbertCanada46.1
- 13JakartaIndonesia44.5
- 14Fort St. JohnCanada42.7
- 15Grand CentreCanada42.6
- 16SaskatoonCanada42.1
- 17NacimientoChile41.5
- 18Ash ShīḩānīyahQatar40.7
- 19Şabāḩ as SālimKuwait40.6
- 20ReginaCanada40.5
+ 2,292 more cities, the next at 39.3 µg/m³
Not counted on this day, too few days measured: Kigali since 24 Sep 2023, Alexandria since 22 Sep 2023, Linares since 4 Sep 2023 and 2 more cities.
Cities counted each 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, Turkey and Iran, which publish only on their own websites. We are building the reader for China's network. The networks of Turkey and Iran don't answer requests from outside their countries, so we can't read them. Most cities there are missing from this board, not clean. Why.