SmogRank / World / Japan / Saitama / March 2025

Most unhealthy days in Saitama, Japan, March 2025

24 cities in Saitama, Japan ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Gyōda, Japan, 0 of 31 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.

← Gyōda 0% 0.75%0
Every city in Saitama, Japan ranked for March 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. 1Gyōda
    0 of 31
  2. 2Asaka
    0 of 31
  3. 3Menuma
    0 of 31
  4. 3Ageo
    0 of 31
  5. 3Niiza
    0 of 31
  6. 3Higashi-Matsuyama
    0 of 31
  7. 7Sōka
    0 of 31
  8. 7Sakado
    0 of 31
  9. 9Kōnosu
    0 of 31
  10. 10Kumagaya
    0 of 31
  11. 10Kawaguchi
    0 of 31
  12. 10Hannō
    0 of 31
  13. 10Chichibu
    0 of 31
  14. 14Kasukabe
    0 of 31
  15. 15Tokorozawa
    0 of 30
  16. 15Kukichūō
    0 of 31
  17. 17Yorii
    0 of 31
  18. 17Saitama
    0 of 31
  19. 19Koshigaya
    0 of 31
  20. 20Minano
    0 of 30
  21. 20Sayama
    0 of 31
  22. 22Honjō
    0 of 31
  23. 23Kawagoe
    0 of 31
  24. 24Ogawamachi
    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 Saitama, Japan, by unhealthy days, PM2.5, March 2025, smogrank.com/jp/region/saitama/history/2025-03?by=days (accessed 7 Oct 2026).

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