SmogRank / Japan / Hokkaido / Kushiro
Kushiro, month by month
Kushiro has a measured daily mean on 1,100 days since 28 July 2023. Its worst month was July 2024, at 51 US AQI (9.2 µg/m³), 951st of 2,566 cities on that month's world ranking. Its cleanest was December 2024, at 19 US AQI (3.4 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 30 US AQI (5.4 µg/m³) in 2024.
Every month since 2023
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
Months without a mean, and why
3 months
| Month | Why |
|---|---|
| Sep 2025 | 14 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 4 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kushiro's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2024 | 519.2 µg/m³ | 951stof 2,566 |
| July 2025 | 519.1 µg/m³ | 1,493rdof 2,889 |
| June 2025 | 417.4 µg/m³ | 1,946thof 2,508 |
| March 2026 | 407.2 µg/m³ | 2,314thof 2,971 |
| May 2025 | 397.1 µg/m³ | 1,581stof 2,826 |
| November 2025 | 397.0 µg/m³ | 1,843rdof 2,715 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Kushiro's worst days
| Day | US AQI | Episode |
|---|---|---|
| 14 Feb 2024 | 8125.4 µg/m³ | Hokkaido and Aomori, Japan, February 2024 |
| 4 Jul 2024 | 8125.0 µg/m³ | – |
| 3 Jul 2024 | 8024.9 µg/m³ | – |
| 1 Mar 2025 | 7120.1 µg/m³ | – |
| 5 Sept 2026 | 6818.2 µg/m³ | – |
| 23 Mar 2026 | 6617.1 µg/m³ | – |
| 28 Oct 2025 | 6617.0 µg/m³ | – |
| 16 Jul 2024 | 6616.9 µg/m³ | – |
| 22 Mar 2025 | 6315.6 µg/m³ | – |
| 31 Mar 2026 | 6215.2 µg/m³ | – |
Daily means, the highest since 28 Jul 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Kushiro, Japan, 28 Jul 2023 – 12 Oct 2026. Monitor data from Ministry of the Environment Air Pollutant Wide Area Monitoring System via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/jp/kushiro/history (accessed 12 Oct 2026).
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.
Kushiro now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).