SmogRank / World / Japan / Saitama / February 2025

Most polluted cities in Saitama, Japan, February 2025

29 cities in Saitama, Japan ranked by their average PM2.5 over the 28 days. Worst: Misato, Saitama at 9.1 µg/m³, #1,302 of 2,574 cities in the world. Cleanest: Honjō at 6.0. 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 February 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%
2Sakado
0%
2Asaka
0%
4Gyōda
0%
4Iruma
0%
6Ageo
0%
7Igusa
0%
8Saitama
0%
9Kōnosu
0%
9Kawaguchi
0%
11Tokorozawa
0%
11Menuma
0%
11Niiza
0%
11Higashi-Matsuyama
0%
15Sōka
0%
15Koshigaya
0%
17Kasukabe
0%
17Chichibu
0%
19Kumagaya
0%
19Hannō
0%
21Kukichūō
0%
22Morohongō
0%
22Minano
0%
24Yorii
0%
24Sayama
0%
26Kodamachō-kodamaminami
0%
27Ogawamachi
0%
28Kawagoe
0%
29Honjō
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

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SmogRank, most polluted cities in Saitama, Japan, PM2.5, February 2025, smogrank.com/jp/region/saitama/history/2025-02 (accessed 7 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.