SmogRank / World / Japan / Saitama / September 2023

Most polluted cities in Saitama, Japan, September 2023

28 cities in Saitama, Japan ranked by their average PM2.5 over the 30 days. Worst: Kazo at 10.2 µg/m³, #538 of 2,128 cities in the world. Cleanest: Koshigaya at 6.2. 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.

← Kazo 0% 0.75%0

Every city in Saitama, Japan ranked for September 2023, 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.

1Kazo
0%
2Gyōda
0%
3Igusa
0%
3Misato, Saitama
0%
5Ageo
0%
6Iruma
0%
7Hanyū
0%
8Kodamachō-kodamaminami
0%
9Menuma
0%
10Yorii
0%
10Niiza
0%
12Kōnosu
0%
12Higashi-Matsuyama
0%
14Tokorozawa
0%
14Kukichūō
0%
14Kawaguchi
0%
14Honjō
0%
14Sayama
0%
19Sakado
0%
19Asaka
0%
21Kawagoe
0%
21Kasukabe
0%
23Chichibu
0%
24Sōka
0%
25Kumagaya
0%
25Saitama
0%
27Ogawamachi
0%
28Koshigaya
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 2023 · All cities in Japan, September 2023 · Saitama now

Use this board

SmogRank, most polluted cities in Saitama, Japan, PM2.5, September 2023, smogrank.com/jp/region/saitama/history/2023-09 (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.