SmogRank / World / Japan / Chiba / January 2026

Most polluted cities in Chiba, Japan, January 2026

30 cities in Chiba, Japan ranked by their average PM2.5 over the 31 days. Worst: Yotsukaidō at 8.9 µg/m³, #1,266 of 2,593 cities in the world. Cleanest: Motona at 4.5. 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.

← Yotsukaidō 0% 0.75%0
Every city in Chiba, Japan ranked for January 2026, 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. 1Yotsukaidō
    0%
  2. 2Noda
    0%
  3. 3Yachimata
    0%
  4. 4Sakura
    0%
  5. 5Yachiyo
    0%
  6. 6Sōsa
    0%
  7. 6Kamagaya
    0%
  8. 8Kashiwa
    0%
  9. 9Sukayama
    0%
  10. 9Narashino
    0%
  11. 11Baraki
    0%
  12. 12Ichihara
    0%
  13. 12Ajiki
    0%
  14. 14Chiba
    0%
  15. 14Inzai
    0%
  16. 16Narita
    0%
  17. 17Kisarazu
    0%
  18. 17Kimitsu
    0%
  19. 19Yokoshiba
    0%
  20. 20Mobara
    0%
  21. 20Kōzaki
    0%
  22. 20Sodegaura
    0%
  23. 23Urayasu
    0%
  24. 23Tōgane
    0%
  25. 25Omigawa
    0%
  26. 26Matsudo
    0%
  27. 27Tateyama
    0%
  28. 27Ichinomiya
    0%
  29. 29Katsuura
    0%
  30. 29Motona
    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, January 2026 · All cities in Japan, January 2026 · Chiba now

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SmogRank, most polluted cities in Chiba, Japan, PM2.5, January 2026, smogrank.com/jp/region/chiba/history/2026-01 (accessed 6 Oct 2026).

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