SmogRank / World / Asia / Japan / Hokkaido

Most polluted cities in Hokkaido, Japan

9 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Chitose at 6.2 µg/m³, #1,672 in the world.

About 0 people in these 4 cities breathed unhealthy air on an average day over the last 30 days.

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: 9 measured citiesAomori: 4 measured cities#9 Tomakomai: 4.0 µg/m³#8 Kushiro: 4.3 µg/m³#7 Hakodate: 4.6 µg/m³#6 Sapporo: 5.0 µg/m³#5 Obihiro: 5.2 µg/m³#4 Kitami: 5.6 µg/m³#3 Tōma: 5.9 µg/m³#1 Chitose: 6.2 µg/m³#2 Asahikawa: 6.2 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Asahikawa 0 0.750
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. 1Asahikawa 0
  2. 2Sapporo 0
  3. 3Hakodate 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.

Use this board

SmogRank, most polluted cities in Hokkaido, Japan, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/jp/region/hokkaido?w=30d.

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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.