SmogRank / World / Japan / Saitama / July 2025

Most polluted cities in Saitama, Japan, July 2025

29 cities in Saitama, Japan ranked by their average PM2.5 over the 31 days. Worst: Menuma at 14.1 µg/m³, #468 of 2,832 cities in the world. Cleanest: Kasukabe at 10.1. 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.

← Ageo 10% 7.5%0

Every city in Saitama, Japan ranked for July 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.

1Ageo
10%
2Asaka
10%
3Niiza
10%
4Kōnosu
10%
5Kawaguchi
10%
6Tokorozawa
7%
7Menuma
6%
8Honjō
6%
9Higashi-Matsuyama
6%
10Morohongō
6%
11Sakado
6%
12Kawagoe
6%
13Kukichūō
6%
14Sōka
6%
14Misato, Saitama
6%
16Koshigaya
6%
17Kumagaya
6%
18Hanyū
5%
19Iruma
3%
20Igusa
3%
21Hannō
3%
22Saitama
3%
23Sayama
3%
24Kasukabe
3%
25Yorii
0%
26Minano
0%
27Ogawamachi
0%
28Kodamachō-kodamaminami
0%
28Chichibu
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, July 2025 · All cities in Japan, July 2025 · Saitama now

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SmogRank, most polluted cities in Saitama, Japan, PM2.5, July 2025, smogrank.com/jp/region/saitama/history/2025-07 (accessed 6 Oct 2026).

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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.