SmogRank / World / Asia / Japan / Saitama

Most polluted cities in Saitama, Japan

31 measured cities, this year; 31 above the WHO annual guideline. Worst: Gyōda at 9.6 µg/m³, #1,098 in the world.

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.

Gunma: 9 measured citiesIbaraki: 19 measured citiesKanagawa: 21 measured citiesNagano: 11 measured citiesSaitama: 31 measured citiesTochigi: 11 measured citiesTokyo: 10 measured citiesYamanashi: 6 measured citiesChiba: 31 measured cities#31 Ogawamachi: 6.9 µg/m³#30 Minano: 7.9 µg/m³#29 Sayama: 8.0 µg/m³#26 Tokorozawa: 8.1 µg/m³#27 Kawagoe: 8.1 µg/m³#28 Kasukabe: 8.1 µg/m³#25 Kumagaya: 8.2 µg/m³#23 Honjō: 8.3 µg/m³#24 Hannō: 8.3 µg/m³#21 Chichibu: 8.4 µg/m³#22 Saitama: 8.4 µg/m³#19 Koshigaya: 8.5 µg/m³#20 Iruma: 8.5 µg/m³#15 Yorii: 8.6 µg/m³#16 Morohongō: 8.6 µg/m³#17 Kōnosu: 8.6 µg/m³#18 Kodamachō-kodamaminami: 8.6 µg/m³#12 Kazo: 8.7 µg/m³#13 Kawaguchi: 8.7 µg/m³#14 Higashi-Matsuyama: 8.7 µg/m³#8 Sōka: 8.8 µg/m³#9 Kukichūō: 8.8 µg/m³#10 Hanyū: 8.8 µg/m³#11 Misato, Saitama: 8.8 µg/m³#5 Sakado: 8.9 µg/m³#6 Igusa: 8.9 µg/m³#7 Ageo: 8.9 µg/m³#3 Menuma: 9.0 µg/m³#4 Niiza: 9.0 µg/m³#2 Asaka: 9.3 µg/m³#1 Gyōda: 9.6 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Gyōda 0% 0.75%0
Every measured city in Saitama, Japan, 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%
  2. 2Asaka 0%
  3. 3Menuma 0%
  4. 3Niiza 0%
  5. 5Sakado 0%
  6. 5Igusalast full day 2 Oct 0%
  7. 5Ageo 0%
  8. 8Sōka 0%
  9. 8Kukichūō 0%
  10. 8Hanyū 0%
  11. 8Misato, Saitama 0%
  12. 12Kazo 0%
  13. 12Kawaguchi 0%
  14. 12Higashi-Matsuyama 0%
  15. 15Yorii 0%
  16. 15Morohongō 0%
  17. 15Kōnosu 0%
  18. 15Kodamachō-kodamaminamilast full day 2 Oct 0%
  19. 19Koshigaya 0%
  20. 19Iruma 0%
  21. 21Chichibulast full day 2 Oct 0%
  22. 21Saitama 0%
  23. 23Honjō 0%
  24. 23Hannō 0%
  25. 25Kumagaya 0%
  26. 26Tokorozawa 0%
  27. 26Kawagoe 0%
  28. 26Kasukabe 0%
  29. 29Sayama 0%
  30. 30Minanolast full day 2 Oct 0%
  31. 31Ogawamachi 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

Estimated: cities without a monitor

Saitama cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Shimotoda≈ 7 µg/m³Good
Fujimino≈ 7 µg/m³Good
Iwatsuki≈ 7 µg/m³Good
Yono≈ 7 µg/m³Good
Yashio≈ 5 µg/m³Good
Wako≈ 8 µg/m³Good
Shiki≈ 6 µg/m³Good
Warabi≈ 7 µg/m³Good
Okegawa≈ 7 µg/m³Good
Yoshikawa≈ 4 µg/m³Good
Tsurugashima≈ 7 µg/m³Good
Kitamoto≈ 7 µg/m³Good
Hasuda≈ 7 µg/m³Good
Hidaka≈ 5 µg/m³Good
Satte≈ 7 µg/m³Good
Hatogaya-honchō≈ 7 µg/m³Good
Kamifukuoka≈ 6 µg/m³Good
Shiraoka≈ 7 µg/m³Good
Ōi≈ 6 µg/m³Good
Shinden≈ 7 µg/m³Good
Sugito≈ 7 µg/m³Good
Miyoshidai≈ 6 µg/m³Good
Washinomiya≈ 7 µg/m³Good
Ishigami≈ 6 µg/m³Good
Matsubushi≈ 4 µg/m³Good
Fukiage-fujimi≈ 7 µg/m³Good
Kurihashi≈ 7 µg/m³Good
Shōbu≈ 7 µg/m³Good
Kisai≈ 7 µg/m³Good
Yamata≈ 6 µg/m³Good
Ōgushi≈ 7 µg/m³Good
Ranzan≈ 6 µg/m³Good
Sashiōgi≈ 7 µg/m³Good

Bad-air episodes in Saitama

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Saitama, Japan, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/saitama?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.