SmogRank / World / Japan / Chiba / October 2023

Most unhealthy days in Chiba, Japan, October 2023

29 cities in Chiba, Japan ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Yachiyo, Japan, 0 of 24 measured days. 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 0% 0.75%0
Every city in Chiba, Japan ranked for October 2023, 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
    0 of 24
  2. 2Kisarazu
    0 of 31
  3. 3Noda
    0 of 31
  4. 4Chiba
    0 of 31
  5. 5Inzai
    0 of 31
  6. 6Kimitsu
    0 of 31
  7. 6Yachimata
    0 of 31
  8. 8Matsudo
    0 of 31
  9. 8Yotsukaidō
    0 of 31
  10. 10Urayasu
    0 of 31
  11. 10Narita
    0 of 31
  12. 10Kamagaya
    0 of 31
  13. 13Kashiwa
    0 of 31
  14. 13Ichihara
    0 of 31
  15. 15Ajiki
    0 of 31
  16. 16Yokoshiba
    0 of 31
  17. 16Mobara
    0 of 31
  18. 16Ichinomiya
    0 of 31
  19. 19Sukayama
    0 of 31
  20. 19Baraki
    0 of 31
  21. 21Sakura
    0 of 31
  22. 21Sōsa
    0 of 31
  23. 21Narashino
    0 of 31
  24. 24Tōgane
    0 of 31
  25. 25Nagadomi
    0 of 27
  26. 26Tateyama
    0 of 29
  27. 27Omigawa
    0 of 31
  28. 28Sodegaura
    0 of 31
  29. 29Choshi
    0 of 31
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, by unhealthy days, PM2.5, October 2023, smogrank.com/jp/region/chiba/history/2023-10?by=days (accessed 7 Oct 2026).

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