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 7 days to 18 Feb 2023: Strumica 85.9 µg/m³, Tetovo 76.2 µg/m³ and Banja Luka 74.5 µg/m³.
- 1StrumicaNorth Macedonia85.9
- 2TetovoNorth Macedonia76.2
- 3Banja LukaBosnia and Herzegovina74.5
- 4SkopjeNorth Macedonia72.0
- 5PrilepNorth Macedonia68.5
- 6MariglianoItaly66.3
- 7KavadarciNorth Macedonia64.5
- 8GostivarNorth Macedonia62.9
- 9Las Palmas de Gran CanariaSpain61.2
- 10IlindenNorth Macedonia54.3
- 11GevgelijaNorth Macedonia54.1
- 12BelgradeSerbia53.3
- 13VoluntariRomania50.5
- 14KoprivnicaCroatia50.3
- 15LjubljanaSlovenia49.5
- 16Spišská Nová VesSlovakia48.7
- 17KorçëAlbania48.5
- 18Novo MestoSlovenia48.5
- 19ArrecifeSpain47.8
- 20BihaćBosnia and Herzegovina47.8
+ 1,162 more cities, 47.7 µg/m³ and below
Not counted on this day, too few days measured: Codlea since 17 Feb 2023, Jasło since 16 Feb 2023, Pejë since 5 Feb 2023 and 56 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
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 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.