SmogRank / World / Japan / Saitama / May 2025

Most polluted cities in Saitama, Japan, May 2025

31 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Gyōda at 11.5 µg/m³, #612 of 2,771 cities in the world. Cleanest: Ogawamachi at 7.6. 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 May 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%
2Kodamachō-kodamaminami
0%
3Ageo
0%
4Asaka
0%
5Morohongō
0%
5Menuma
0%
5Niiza
0%
8Yorii
0%
8Hannō
0%
10Sakado
0%
10Chichibu
0%
10Higashi-Matsuyama
0%
10Iruma
0%
14Misato, Saitama
0%
15Sōka
0%
15Minano
0%
15Kumagaya
0%
15Igusa
0%
19Kōnosu
0%
19Kasukabe
0%
21Kazo
0%
22Kukichūō
0%
22Kawaguchi
0%
22Honjō
0%
22Hanyū
0%
22Sayama
0%
22Saitama
0%
28Tokorozawa
0%
28Koshigaya
0%
30Kawagoe
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

All cities in the world, May 2025 · All cities in Japan, May 2025 · Saitama now

Use this board

SmogRank, most polluted cities in Saitama, Japan, PM2.5, May 2025, smogrank.com/jp/region/saitama/history/2025-05 (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.