SmogRank / History / City race

Cities in Japan, 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 to9 Dec 2024 That day's board

The worst cities in Japan for PM2.5 over the 30 days to 9 Dec 2024: Uekimachi-mōno 12.8 µg/m³, Ōmuta 12.5 µg/m³ and Misato, Saitama 12.1 µg/m³.

  1. 1Uekimachi-mōnoKumamoto12.8
  2. 2ŌmutaFukuoka12.5
  3. 3Misato, SaitamaSaitama12.1
  4. 4KotōKumamoto12.0
  5. 5ChikugoFukuoka12.0
  6. 6KumamotoKumamoto11.7
  7. 7SaijōEhime11.7
  8. 8MiyakonojōMiyazaki11.6
  9. 9Tanushimarumachi-toyokiFukuoka11.5
  10. 10HigashigōSaga11.2
  11. 11AraoKumamoto11.2
  12. 12OnodaYamaguchi11.1
  13. 13UtoKumamoto11.0
  14. 14GyōdaSaitama10.9
  15. 15BizenOkayama10.9
  16. 16HonmachiKumamoto10.8
  17. 17ŌzuKumamoto10.8
  18. 18NakatsuOita10.8
  19. 19KanoyaKagoshima10.8
  20. 20HyūgaMiyazaki10.7

+ 524 more cities, 10.5 µg/m³ and below

Not counted on this day, too few days measured: Takasaki since 28 Nov 2024.

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.