Worst air pollution Sault Ste. Marie, today and tomorrow
Today (16 July): Air quality in Sault Ste. Marie is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 AM (O3: 41.5/100).
Tomorrow (17 July 2026): Air quality in Sault Ste. Marie is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 33.1/100). 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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Sault Ste. Marie's air quality reflects its steel-industry legacy on the St. Marys River, with the Algoma Steel plant contributing industrial PM2.5 alongside vehicle traffic across the International Bridge to Michigan.
Today - 16 July | Pollution peaks at 07:00
AQI:
Medium
41.5/100
PM2.5 (fine particles):
Good
11.4/100
PM10 (coarse particles):
Good
4.0/100
NO2 (nitrogen dioxide):
Fair
31.4/100
O3 (ozone):
Medium
41.5/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Good
13.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 11:00
AQI:
Fair
33.1/100
PM2.5 (fine particles):
Good
6.8/100
PM10 (coarse particles):
Good
2.6/100
NO2 (nitrogen dioxide):
Fair
21.3/100
O3 (ozone):
Fair
33.1/100
SO2 (sulfur dioxide):
Good
1.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.0/100
PM1 (ultrafine particles):
Good
7.8/100
Pollen forecast in Sault Ste. Marie
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Sault Ste. Marie
Frequently Asked Questions
Is air quality bad in Sault Ste. Marie right now?
On 16 July 2026, overall air quality in Sault Ste. Marie is fair. NO2 is the main pollutant at 31.4/100. Pollution peaks around 7:00 AM (O3: 41.5/100).
Will air quality be worse tomorrow in Sault Ste. Marie?
On 17 July 2026, air quality conditions in Sault Ste. Marie will be similar to today, with AQI forecast at fair at 33.1/100. Pollution peaks around 11:00 AM (O3: 33.1/100).
When is air pollution at its worst in Sault Ste. Marie?
Sault Ste. Marie sees clear seasonal swings in air quality, driven in part by its steel plant on the St. Marys River bordering Michigan. Air quality is generally very good outside of wildfire season, though hot, dry summers can bring smoky, hazy stretches when fires burn across the wider region. Wind direction across the river determines how much of the industrial output drifts into town on any given day.
Are air quality levels in Sault Ste. Marie 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