SmogRank / World / Japan / Saitama / October 2025

Most polluted cities in Saitama, Japan, October 2025

28 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Gyōda at 10.1 µg/m³, #527 of 2,564 cities in the world. Cleanest: Ogawamachi at 5.0. 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 October 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.

1Gyōda
0%
2Misato, Saitama
0%
3Kōnosu
0%
4Asaka
0%
5Hanyū
0%
5Ageo
0%
5Niiza
0%
8Sōka
0%
8Kazo
0%
8Kawaguchi
0%
8Igusa
0%
8Higashi-Matsuyama
0%
13Menuma
0%
13Kumagaya
0%
15Kukichūō
0%
16Sakado
0%
16Saitama
0%
18Koshigaya
0%
19Iruma
0%
20Yorii
0%
20Kodamachō-kodamaminami
0%
20Kasukabe
0%
23Honjō
0%
24Kawagoe
0%
25Tokorozawa
0%
26Chichibu
0%
27Minano
0%
28Ogawamachi
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, October 2025 · All cities in Japan, October 2025 · Saitama now

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SmogRank, most polluted cities in Saitama, Japan, PM2.5, October 2025, smogrank.com/jp/region/saitama/history/2025-10 (accessed 6 Oct 2026).

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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.