SmogRank / World / Japan / Saitama / September 2026

Most polluted cities in Saitama, Japan, September 2026

31 cities in Saitama, Japan ranked by their average PM2.5 over the 30 days. Worst: Niiza at 6.8 µg/m³, #1,331 of 2,949 cities in the world. Cleanest: Ogawamachi at 3.7. 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.

← Niiza 0% 0.75%0

Every city in Saitama, Japan ranked for September 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.

1Niiza
0%
2Gyōda
0%
3Asaka
0%
4Menuma
0%
5Kazo
0%
5Ageo
0%
7Kukichūō
0%
7Koshigaya
0%
7Kawaguchi
0%
10Higashi-Matsuyama
0%
11Sōka
0%
11Honjō
0%
11Misato, Saitama
0%
14Hanyū
0%
14Saitama
0%
16Kōnosu
0%
16Igusa
0%
18Kawagoe
0%
19Sakado
0%
20Morohongō
0%
21Kodamachō-kodamaminami
0%
21Kasukabe
0%
23Kumagaya
0%
23Sayama
0%
23Iruma
0%
26Yorii
0%
27Hannō
0%
28Tokorozawa
0%
29Minano
0%
30Chichibu
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, September 2026 · All cities in Japan, September 2026 · Saitama now

Use this board

SmogRank, most polluted cities in Saitama, Japan, PM2.5, September 2026, smogrank.com/jp/region/saitama/history/2026-09 (accessed 6 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.