SmogRank / World / Asia / Japan / Hokkaido

Most polluted cities in Hokkaido, Japan

10 measured cities, this year; 10 above the WHO annual guideline. Worst: Chitose at 8.3 µg/m³, #1,667 in the world.

About 1.01K people in these 4 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.

Hokkaido: 10 measured citiesAomori: 3 measured cities#10 Kushiro: 5.5 µg/m³#9 Tomakomai: 6.1 µg/m³#8 Obihiro: 6.4 µg/m³#6 Tōma: 6.6 µg/m³#7 Kitami: 6.6 µg/m³#5 Sapporo: 6.7 µg/m³#4 Hakodate: 7.0 µg/m³#3 Asahikawa: 7.4 µg/m³#2 Muroran: 8.0 µg/m³#1 Chitose: 8.3 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Hakodate 1.01K 1K0
Every measured city in Hokkaido, Japan 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. 1Hakodate 1.01K
  2. 2Asahikawa 0
  3. 3Sapporo 0
  4. 4Tomakomai 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

Hokkaido 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
Ebetsu≈ 4 µg/m³Good
Otaru≈ 5 µg/m³Good
Iwamizawa≈ 4 µg/m³Good
Eniwa≈ 5 µg/m³Good
Kitahiroshima≈ 5 µg/m³Good
Ishikari≈ 5 µg/m³Good
Noboribetsu≈ 4 µg/m³Good
Hokuto≈ 3 µg/m³Good
Takikawa≈ 3 µg/m³Good
Otofuke≈ 2 µg/m³Good
Kamiiso≈ 3 µg/m³Good
Abashiri≈ 3 µg/m³Good
Date≈ 4 µg/m³Good
Wakkanai≈ 4 µg/m³Good
Nemuro≈ 4 µg/m³Good
Bibai≈ 3 µg/m³Good
Honchō≈ 3 µg/m³Good
Nayoro≈ 3 µg/m³Good
Makubetsu≈ 3 µg/m³Good
Rumoi≈ 3 µg/m³Good
Fukagawa≈ 3 µg/m³Good
Shimo-furano≈ 3 µg/m³Good
Sarubetsu≈ 2 µg/m³Good
Nakashibetsu≈ 2 µg/m³Good
Mombetsu≈ 2 µg/m³Good
Motomachi≈ 2 µg/m³Good
Shizunai-furukawachō≈ 3 µg/m³Good
Shibetsu≈ 3 µg/m³Good
Furano≈ 3 µg/m³Good
Sunagawa≈ 3 µg/m³Good
Minamishibetsuchō≈ 3 µg/m³Good
Engaru≈ 2 µg/m³Good
Ashibetsu≈ 3 µg/m³Good
Yoichi≈ 4 µg/m³Good
Memuro-minami≈ 2 µg/m³Good
Shibetsu≈ 3 µg/m³Good
Shiraoi≈ 4 µg/m³Good
Tōbetsu≈ 4 µg/m³Good
Yakumo≈ 4 µg/m³Good
Kutchan≈ 4 µg/m³Good

Bad-air episodes in Hokkaido

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 Hokkaido, Japan, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/jp/region/hokkaido?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 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.