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 to22 Mar 2024 That day's board

The worst cities in Japan for PM2.5 over the 30 days to 22 Mar 2024: Maebaru-chūō 12.2 µg/m³, Saijō 12.0 µg/m³ and Nakatsu 11.9 µg/m³.

  1. 1Maebaru-chūōFukuoka12.2
  2. 2SaijōEhime12.0
  3. 3NakatsuOita11.9
  4. 4KasaokaOkayama11.5
  5. 5KanoyaKagoshima11.3
  6. 6MiyakonojōMiyazaki11.2
  7. 7ShikokuchūōEhime11.1
  8. 8NiihamaEhime11.0
  9. 9YukuhashiFukuoka10.9
  10. 10ŌmutaFukuoka10.9
  11. 11FukuyamaHiroshima10.7
  12. 12Kan’onjichōKagawa10.6
  13. 13FukuokaFukuoka10.6
  14. 14KogaFukuoka10.6
  15. 15KitakyushuFukuoka10.5
  16. 16IyoEhime10.5
  17. 17ChikugoFukuoka10.5
  18. 18AridaWakayama10.5
  19. 19YawataKyoto10.4
  20. 20TsurusakiOita10.3

+ 470 more cities, 10.3 µg/m³ and below

Not counted on this day, too few days measured: Misato, Saitama since 21 Feb 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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.