SmogRank / World / Japan / Saitama / August 2025

Most polluted cities in Saitama, Japan, August 2025

29 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Gyōda at 13.7 µg/m³, #440 of 2,841 cities in the world. Cleanest: Chichibu at 9.8. 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 August 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%
2Tokorozawa
0%
2Ageo
0%
4Menuma
0%
5Niiza
0%
6Iruma
0%
7Kawagoe
0%
8Kōnosu
0%
9Kawaguchi
0%
9Higashi-Matsuyama
0%
11Sakado
0%
12Yorii
0%
13Asaka
0%
14Honjō
0%
15Igusa
0%
16Kodamachō-kodamaminami
0%
17Morohongō
0%
17Kukichūō
0%
19Saitama
0%
20Ogawamachi
0%
20Koshigaya
0%
22Minano
0%
22Hannō
0%
22Sayama
0%
25Kumagaya
0%
26Kazo
0%
26Hanyū
0%
28Kasukabe
0%
29Chichibu
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

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SmogRank, most polluted cities in Saitama, Japan, PM2.5, August 2025, smogrank.com/jp/region/saitama/history/2025-08 (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.