SmogRank / World / Japan / Saitama / 2025

Most polluted cities in Saitama, Japan, 2025

31 cities in Saitama, Japan ranked by their average PM2.5 over the 365 days; 31 above the WHO annual guideline (5.0 µg/m³). Worst: Gyōda at 11.7 µg/m³, #618 of 2,624 cities in the world. Cleanest: Ogawamachi at 7.8. 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.

← Misato, Saitama 1% 0.75%0

Every city in Saitama, Japan ranked for 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.

1Misato, Saitama
1%
2Gyōda
1%
3Sōka
1%
4Ageo
1%
5Asaka
1%
6Niiza
1%
7Kōnosu
1%
8Kawaguchi
1%
9Koshigaya
1%
10Tokorozawa
1%
11Morohongō
1%
12Honjō
1%
13Menuma
1%
14Higashi-Matsuyama
1%
15Sakado
1%
16Kukichūō
1%
17Kumagaya
1%
18Kawagoe
1%
19Hanyū
0%
20Kazo
0%
21Igusa
0%
22Iruma
0%
23Hannō
0%
24Sayama
0%
25Kasukabe
0%
26Saitama
0%
27Yorii
0%
27Kodamachō-kodamaminami
0%
29Chichibu
0%
30Minano
0%
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

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

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