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.
The worst cities in Japan for PM2.5 over the 30 days to 24 Sep 2023: Nagai 15.8 µg/m³, Minamata 13.6 µg/m³ and Takasaki 13.5 µg/m³.
- 1NagaiYamagata15.8
- 2MinamataKumamoto13.6
- 3TakasakiGunma13.5
- 4IyoEhime13.0
- 5HonmachiKumamoto12.9
- 6NiihamaEhime12.0
- 7SanoTochigi11.8
- 8KasaokaOkayama11.7
- 9ShikokuchūōEhime11.6
- 10ŌtsukiYamanashi10.8
- 11TamanaKumamoto10.7
- 12Uekimachi-mōnoKumamoto10.6
- 13KiryūGunma10.3
- 14ChikuseiIbaraki10.2
- 15BizenOkayama10.2
- 16Kan’onjichōKagawa10.0
- 17ImabariEhime10.0
- 18KirishimaKagoshima10.0
- 19NakatsuOita9.9
- 20FujinomiyaShizuoka9.9
+ 508 more cities, the next at 9.7 µg/m³
Not counted on this day, too few days measured: Wakasugi since 23 Sep 2023, Yame since 23 Sep 2023, Tanushimarumachi-toyoki since 21 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 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.