SmogRank / World / Japan / Chiba / July 2025

Most polluted cities in Chiba, Japan, July 2025

31 cities in Chiba, Japan ranked by their average PM2.5 over the 31 days. Worst: Yachiyo at 13.5 µg/m³, #525 of 2,832 cities in the world. Cleanest: Ichinomiya at 8.5. 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.

← Yachiyo 10% 9%0
Every city in Chiba, 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. 1Yachiyo
    10%
  2. 2Noda
    10%
  3. 3Chiba
    10%
  4. 4Tateyama
    10%
  5. 5Ichihara
    10%
  6. 6Nagadomi
    8%
  7. 7Yachimata
    7%
  8. 8Baraki
    7%
  9. 9Motona
    7%
  10. 10Tōgane
    7%
  11. 11Sakura
    6%
  12. 12Kashiwa
    6%
  13. 12Kamagaya
    6%
  14. 14Narita
    6%
  15. 15Urayasu
    6%
  16. 15Narashino
    6%
  17. 17Mobara
    6%
  18. 18Kimitsu
    6%
  19. 18Kōzaki
    6%
  20. 20Yokoshiba
    6%
  21. 21Sōsa
    6%
  22. 22Katsuura
    6%
  23. 23Sukayama
    3%
  24. 24Matsudo
    3%
  25. 24Ajiki
    3%
  26. 26Yotsukaidō
    3%
  27. 26Inzai
    3%
  28. 28Kisarazu
    3%
  29. 29Sodegaura
    3%
  30. 30Omigawa
    0%
  31. 31Ichinomiya
    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

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

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