SmogRank / World / Asia / Japan / Aichi

Most polluted cities in Aichi, Japan

23 measured cities, this year; 23 above the WHO annual guideline. Worst: Owariasahi at 10.9 µg/m³, #827 in the world.

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.

Mie: 16 measured citiesNagano: 11 measured citiesShizuoka: 19 measured citiesFukui: 7 measured citiesAichi: 23 measured citiesGifu: 15 measured cities#22 Shinshiro: 7.7 µg/m³#23 Kaminoma: 7.7 µg/m³#21 Nisshin: 7.8 µg/m³#18 Toyota: 8.0 µg/m³#19 Seto: 8.0 µg/m³#20 Anjō: 8.0 µg/m³#17 Toyohashi: 8.3 µg/m³#15 Ichinomiya: 8.4 µg/m³#16 Ama: 8.4 µg/m³#12 Gamagōri: 8.5 µg/m³#13 Chiryū: 8.5 µg/m³#14 Minamichita: 8.5 µg/m³#11 Handa: 8.8 µg/m³#10 Nagoya: 8.9 µg/m³#9 Inuyama: 9.1 µg/m³#7 Okazaki: 9.2 µg/m³#8 Nishio: 9.2 µg/m³#6 Tōkai: 9.3 µg/m³#4 Tokoname: 9.6 µg/m³#5 Hekinan: 9.6 µg/m³#3 Kariya: 9.8 µg/m³#2 Tahara: 10.3 µg/m³#1 Owariasahi: 10.9 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Owariasahi 0% 0.75%0
Every measured city in Aichi, Japan, 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.
  1. 1Owariasahi 0%
  2. 2Tahara 0%
  3. 3Kariya 0%
  4. 4Tokoname 0%
  5. 4Hekinan 0%
  6. 6Tōkai 0%
  7. 7Okazaki 0%
  8. 7Nishio 0%
  9. 9Inuyama 0%
  10. 10Nagoya 0%
  11. 11Handa 0%
  12. 12Gamagōri 0%
  13. 12Chiryū 0%
  14. 12Minamichitalast full day 2 Oct 0%
  15. 15Ichinomiya 0%
  16. 15Ama 0%
  17. 17Toyohashi 0%
  18. 18Toyota 0%
  19. 18Seto 0%
  20. 18Anjō 0%
  21. 21Nisshin 0%
  22. 22Shinshiro 0%
  23. 22Kaminomalast full day 2 Oct 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

Estimated: cities without a monitor

Aichi cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Kasugai≈ 8 µg/m³Good
Toyokawa≈ 7 µg/m³Good
Komaki≈ 8 µg/m³Good
Inazawa≈ 7 µg/m³Good
Kōnan≈ 8 µg/m³Good
Ōbu≈ 11 µg/m³Moderate
Kitanagoya≈ 8 µg/m³Good
Chita≈ 11 µg/m³Moderate
Toyoake≈ 11 µg/m³Moderate
Tsushima≈ 7 µg/m³Good
Kiyosu≈ 8 µg/m³Good
Miyoshi≈ 10 µg/m³Moderate
Aisai≈ 7 µg/m³Good
Nagakute≈ 9 µg/m³Moderate
Ogawa≈ 8 µg/m³Good
Takahama≈ 8 µg/m³Good
Iwakura≈ 8 µg/m³Good
Morowa≈ 10 µg/m³Moderate
Taketoyo≈ 8 µg/m³Good
Yatomi≈ 8 µg/m³Good
Kōta≈ 9 µg/m³Good
Kanie≈ 8 µg/m³Good
Fusō≈ 12 µg/m³Moderate
Kuroda≈ 8 µg/m³Good
Ōharu≈ 8 µg/m³Good
Ōguchi≈ 12 µg/m³Moderate
Ishiki≈ 9 µg/m³Good
Sobue≈ 7 µg/m³Good
Toyohama≈ 8 µg/m³Good
Toyoyama≈ 8 µg/m³Good

Bad-air episodes in Aichi

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Aichi, Japan, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/aichi?w=year.

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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.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.