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.

About 183K people in these 10 cities breathed unhealthy air on an average day of July 2025.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Kawaguchi 58.8K 50K0
Every city in Saitama, Japan ranked for July 2025 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Kawaguchi
    58.8K
  2. 2Saitama
    42.7K
  3. 3Kawagoe
    22.9K
  4. 4Koshigaya
    22.3K
  5. 5Kōnosu
    11.3K
  6. 6Kukichūō
    9.72K
  7. 7Kasukabe
    7.41K
  8. 8Sakado
    6.47K
  9. 9Menuma
    1.79K
  10. 10Ogawamachi
    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 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.