SmogRank / World / Japan / Saitama / January 2026

Most polluted cities in Saitama, Japan, January 2026

31 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Gyōda at 8.2 µg/m³, #1,430 of 2,593 cities in the world. Cleanest: Ogawamachi at 4.6. 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 January 2026, 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%
3Hanyū
0%
4Sōka
0%
5Kawaguchi
0%
5Kasukabe
0%
5Asaka
0%
8Kukichūō
0%
8Koshigaya
0%
8Kazo
0%
8Ageo
0%
8Saitama
0%
13Sakado
0%
14Igusa
0%
15Kōnosu
0%
15Niiza
0%
15Higashi-Matsuyama
0%
18Chichibu
0%
19Kumagaya
0%
20Tokorozawa
0%
20Menuma
0%
20Iruma
0%
23Hannō
0%
23Sayama
0%
25Morohongō
0%
25Kawagoe
0%
27Kodamachō-kodamaminami
0%
28Yorii
0%
28Minano
0%
30Honjō
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, January 2026, smogrank.com/jp/region/saitama/history/2026-01 (accessed 7 Oct 2026).

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