SmogRank / World / Japan / Aichi / 2025

Most polluted cities in Aichi, Japan, 2025

23 cities in Aichi, Japan ranked by their average PM2.5 over the 365 days; 23 above the WHO annual guideline (5.0 µg/m³). Worst: Owariasahi at 11.4 µg/m³, #655 of 2,624 cities in the world. Cleanest: Shinshiro at 7.2. A city needs measurements on 70% of the days to be ranked.

About 23.4K people in these 9 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.

← Nagoya 12.9K 10K0
Every city in Aichi, 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. 1Nagoya
    12.9K
  2. 2Toyohashi
    3.14K
  3. 3Okazaki
    2.13K
  4. 4Ichinomiya
    2.11K
  5. 5Toyota
    1.18K
  6. 6Kariya
    852
  7. 7Gamagōri
    444
  8. 8Tōkai
    315
  9. 9Nisshin
    273
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, 2025 · All cities in Japan, 2025 · Aichi now

Use this board

SmogRank, most polluted cities in Aichi, Japan, PM2.5, 2025, smogrank.com/jp/region/aichi/history/2025 (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.