SmogRank / World / Japan / Saitama / January 2025

Most polluted cities in Saitama, Japan, January 2025

31 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Misato, Saitama at 12.2 µg/m³, #708 of 2,426 cities in the world. Cleanest: Honjō at 5.7. 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 0% 0.75%0

Every city in Saitama, Japan ranked for January 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
0%
2Sōka
0%
3Gyōda
0%
4Igusa
0%
5Kazo
0%
6Koshigaya
0%
6Kawaguchi
0%
6Asaka
0%
9Niiza
0%
10Kasukabe
0%
10Ageo
0%
10Saitama
0%
13Iruma
0%
14Sakado
0%
15Kōnosu
0%
15Hanyū
0%
17Higashi-Matsuyama
0%
18Kukichūō
0%
19Menuma
0%
20Tokorozawa
0%
21Kumagaya
0%
22Morohongō
0%
23Hannō
0%
23Chichibu
0%
25Kawagoe
0%
26Sayama
0%
27Yorii
0%
28Minano
0%
29Kodamachō-kodamaminami
0%
30Ogawamachi
0%
31Honjō
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, January 2025 · All cities in Japan, January 2025 · Saitama now

Use this board

SmogRank, most polluted cities in Saitama, Japan, PM2.5, January 2025, smogrank.com/jp/region/saitama/history/2025-01 (accessed 7 Oct 2026).

Download top 10 (PNG)

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.