SmogRank / World / Japan / Chiba / 2025

Most polluted cities in Chiba, Japan, 2025

31 cities in Chiba, Japan ranked by their average PM2.5 over the 365 days; 31 above the WHO annual guideline (5.0 µg/m³). Worst: Noda at 10.3 µg/m³, #865 of 2,624 cities in the world. Cleanest: Katsuura at 7.1. A city needs measurements on 70% of the days to be ranked.

About 19.6K people in these 10 cities breathed unhealthy air on an average day of 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.

← Chiba 8.23K 8K0
Every city in Chiba, Japan ranked for 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. 1Chiba
    8.23K
  2. 2Kashiwa
    3.64K
  3. 3Ichihara
    2.38K
  4. 4Matsudo
    1.37K
  5. 5Narashino
    993
  6. 6Sakura
    973
  7. 7Urayasu
    939
  8. 8Kimitsu
    471
  9. 9Kisarazu
    381
  10. 10Sodegaura
    182
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 Chiba, Japan, PM2.5, 2025, smogrank.com/jp/region/chiba/history/2025 (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.