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.

About 0 people in these 10 cities breathed unhealthy air on an average day so far this year.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

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.
← Menuma 0 0.750
Every measured city in Saitama, Japan with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Menuma 0
  2. 2Sakado 0
  3. 3Kukichūō 0
  4. 4Kawaguchi 0
  5. 5Kōnosu 0
  6. 6Koshigaya 0
  7. 7Saitama 0
  8. 8Kawagoe 0
  9. 8Kasukabe 0
  10. 10Ogawamachi 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.