SmogRank / World / Asia / Japan / Toyama

Most polluted cities in Toyama, Japan

8 measured cities, this year; 8 above the WHO annual guideline. Worst: Nyūzen at 10.0 µg/m³, #995 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.

Ishikawa: 9 measured citiesNagano: 11 measured citiesNiigata: 12 measured citiesToyama: 8 measured citiesFukui: 7 measured citiesGifu: 15 measured cities#8 Oyabe: 7.2 µg/m³#7 Tonami: 8.4 µg/m³#6 Uozu: 8.7 µg/m³#5 Takaoka: 9.4 µg/m³#3 Himimachi: 9.6 µg/m³#4 Imizu: 9.6 µg/m³#2 Toyama: 9.8 µg/m³#1 Nyūzen: 10.0 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Toyama 0% 0.75%0
Every measured city in Toyama, 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. 1Toyamalast full day 21 Sept 0%
  2. 2Nyūzenlast full day 21 Sept 0%
  3. 3Himimachilast full day 21 Sept 0%
  4. 3Imizulast full day 21 Sept 0%
  5. 5Takaokalast full day 21 Sept 0%
  6. 6Uozulast full day 21 Sept 0%
  7. 7Tonamilast full day 21 Sept 0%
  8. 8Oyabelast full day 21 Sept 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

Toyama 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
Nanto-shi≈ 4 µg/m³Good
Nanto≈ 4 µg/m³Good
Himi≈ 6 µg/m³Good
Kurobe-shi≈ 5 µg/m³Good
Nishishinminato≈ 6 µg/m³Good
Gohyakkoku≈ 6 µg/m³Good
Yatsuomachi-higashikumisaka≈ 3 µg/m³Good
Kamiichi≈ 6 µg/m³Good
Fukumitsu≈ 4 µg/m³Good

Bad-air episodes in Toyama

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 Toyama, Japan, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/jp/region/toyama?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.