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.
About 1.68K people in these 3 cities breathed unhealthy air on an average day so far this year.
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.
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.
| City | 7-day estimate |
|---|---|
| Nanto-shi | ≈ 4 µg/m³ |
| Nanto | ≈ 4 µg/m³ |
| Himi | ≈ 6 µg/m³ |
| Kurobe-shi | ≈ 5 µg/m³ |
| Nishishinminato | ≈ 6 µg/m³ |
| Gohyakkoku | ≈ 6 µg/m³ |
| Yatsuomachi-higashikumisaka | ≈ 3 µg/m³ |
| Kamiichi | ≈ 6 µg/m³ |
| Fukumitsu | ≈ 4 µg/m³ |
Bad-air episodes in Toyama
- Japan and South Korea, July 202616 to 25 July 2026, 10 days205 cities39 µg/m³peak, Mooka
- Japan and South Korea, March 202623 to 31 March 2026, 9 days322 cities86 µg/m³peak, Pohang
- Japan and South Korea, June and July 202530 June to 10 July 2025, 11 days532 cities117 µg/m³peak, Kōka
- Japan, May 202520 to 21 May 2025, 2 days107 cities34 µg/m³peak, Ayase
- Japan and South Korea, March 202521 to 27 March 2025, 7 days479 cities320 µg/m³peak, Yecheon
- Japan and South Korea, February and March 202526 February to 2 March 2025, 5 days200 cities70 µg/m³peak, Fukuyama
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
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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.
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.