Worst air pollution Muroran, today and tomorrow
Today (16 July): Air quality in Muroran is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (O3: 34.3/100).
Tomorrow (17 July 2026): Air quality in Muroran is fair. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 25.7/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Muroran's air quality reflects the Hokkaido Pacific Ocean and Uchiura Bay coastal position adjacent to the Nippon Steel Muroran Works, with vehicle traffic on surrounding roads and the steel, chemical, and port corridor generating elevated industrial PM2.5 and SO₂. Consistent Pacific and Uchiura Bay maritime breezes provide coastal ventilation, while the steel complex's industrial scale represents Muroran's most distinctive local air quality contribution and the outstanding coastal exposure generally maintains moderate readings outside direct industrial plume events throughout most of the year.
Today - 16 July | Pollution peaks at 00:00
AQI:
Fair
34.3/100
PM2.5 (fine particles):
Good
7.1/100
PM10 (coarse particles):
Good
2.7/100
NO2 (nitrogen dioxide):
Good
5.0/100
O3 (ozone):
Fair
34.3/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.6/100
PM1 (ultrafine particles):
Good
7.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
25.7/100
PM2.5 (fine particles):
Good
5.9/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Good
4.4/100
O3 (ozone):
Fair
25.7/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
6.1/100
Frequently Asked Questions
Is air quality bad in Muroran right now?
On 16 July 2026, overall air quality in Muroran is fair. AQI is the main air quality indicator at 34.3/100. Pollution peaks around 12:00 AM (O3: 34.3/100).
Will air quality be worse tomorrow in Muroran?
On 17 July 2026, air quality conditions in Muroran will be similar to today, with AQI forecast at fair at 25.7/100. Pollution peaks around 3:00 PM (O3: 25.7/100).
When is air pollution at its worst in Muroran?
Pollution in Muroran typically rises when traffic emissions, heavy industry such as steel, cement, or petrochemical processing, along with fishing fleet activity combine, especially once windblown dust events occur. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Onshore breezes usually help clear the air, but pollution can build up when winds are light.
Are air quality levels in Muroran based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app