SmogRank / World / Japan / Toyama / December 2025

Most polluted cities in Toyama, Japan, December 2025

9 cities in Toyama, Japan ranked by their average PM2.5 over the 31 days. Worst: Nyūzen at 7.0 µg/m³, #2,115 of 2,960 cities in the world. Cleanest: Namerikawa at 3.2. A city needs measurements on 70% of the days to be ranked.

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.

← Nyūzen 0% 0.75%0
Every city in Toyama, Japan ranked for December 2025, 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. 1Nyūzen
    0%
  2. 2Himimachi
    0%
  3. 3Imizu
    0%
  4. 4Takaoka
    0%
  5. 5Uozu
    0%
  6. 6Toyama
    0%
  7. 7Oyabe
    0%
  8. 8Tonami
    0%
  9. 9Namerikawa
    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

All cities in the world, December 2025 · All cities in Japan, December 2025 · Toyama now

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SmogRank, most polluted cities in Toyama, Japan, PM2.5, December 2025, smogrank.com/jp/region/toyama/history/2025-12 (accessed 6 Oct 2026).

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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.