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 to20 Jan 2024 That day's board

The worst cities in Japan for PM2.5 over the 30 days to 20 Jan 2024: Tanushimarumachi-toyoki 15.7 µg/m³, Miyakonojō 14.7 µg/m³ and Higashigō 14.7 µg/m³.

  1. 1Tanushimarumachi-toyokiFukuoka15.7
  2. 2MiyakonojōMiyazaki14.7
  3. 3HigashigōSaga14.7
  4. 4Maebaru-chūōFukuoka14.2
  5. 5ŌmutaFukuoka13.9
  6. 6ChikugoFukuoka13.8
  7. 7Misato, SaitamaSaitama13.5
  8. 8ChikuseiIbaraki13.3
  9. 9KurumeFukuoka12.7
  10. 10JōsōIbaraki12.7
  11. 11Kanzakimachi-kanzakiSaga12.6
  12. 12Imarichō-kōSaga12.6
  13. 13TosuSaga12.5
  14. 14YanagawaFukuoka12.4
  15. 15Shimo-tsumaIbaraki12.4
  16. 16FukuokaFukuoka12.4
  17. 17UkihaFukuoka12.4
  18. 18OgōriFukuoka12.2
  19. 19TagawaFukuoka12.0
  20. 20SagaSaga12.0

+ 456 more cities, 11.9 µg/m³ and below

Not counted on this day, too few days measured: Uekimachi-mōno since 4 Jan 2024, Kurashiki since 4 Jan 2024, Kasaoka since 2 Jan 2024 and Nagai since 13 Dec 2023.

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.