SmogRank / World / Japan / Chiba / July 2025

Most polluted cities in Chiba, Japan, July 2025

31 cities in Chiba, Japan ranked by their average PM2.5 over the 31 days. Worst: Yachiyo at 13.5 µg/m³, #525 of 2,832 cities in the world. Cleanest: Ichinomiya at 8.5. A city needs measurements on 70% of the days to be ranked.

About 212K 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.

← Chiba 94.8K 90K0
Every city in Chiba, 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. 1Chiba
    94.8K
  2. 2Kashiwa
    28K
  3. 3Ichihara
    27.4K
  4. 4Matsudo
    16.1K
  5. 5Narashino
    11.4K
  6. 6Sakura
    11.2K
  7. 7Urayasu
    11.1K
  8. 8Kimitsu
    5.36K
  9. 9Kisarazu
    4.39K
  10. 10Sodegaura
    2.09K
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 · Chiba now

Use this board

SmogRank, most polluted cities in Chiba, Japan, PM2.5, July 2025, smogrank.com/jp/region/chiba/history/2025-07 (accessed 6 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.