SmogRank / World / Japan / Yamaguchi / July 2025

Most polluted cities in Yamaguchi, Japan, July 2025

13 cities in Yamaguchi, Japan ranked by their average PM2.5 over the 31 days. Worst: Iwakuni at 14.5 µg/m³, #423 of 2,832 cities in the world. Cleanest: Hagi at 9.5. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Iwakuni 6% 6%0
Every city in Yamaguchi, Japan ranked for July 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Iwakuni
    6%
  2. 2Yanai
    6%
  3. 3Shūnan
    3%
  4. 4Kudamatsu
    3%
  5. 5Hōfu
    0%
  6. 6Yamaguchi
    0%
  7. 7Ube
    0%
  8. 7Mine
    0%
  9. 9Onoda
    0%
  10. 10Shimonoseki
    0%
  11. 10Nagato
    0%
  12. 12Hikari
    0%
  13. 13Hagi
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, July 2025 · All cities in Japan, July 2025 · Yamaguchi now

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SmogRank, most polluted cities in Yamaguchi, Japan, PM2.5, July 2025, smogrank.com/jp/region/yamaguchi/history/2025-07 (accessed 6 Oct 2026).

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