Worst air pollution Saint John, today and tomorrow
Today (16 July): Air quality in Saint John is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 36.4/100).
Tomorrow (17 July 2026): Air quality in Saint John is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 29.7/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Saint John's air quality is shaped by the Irving Oil refinery and pulp-mill operations, historically among the dominant local sources, though strong Bay of Fundy winds provide frequent ventilation.
Today - 16 July | Pollution peaks at 08:00
AQI:
Fair
36.4/100
PM2.5 (fine particles):
Good
7.1/100
PM10 (coarse particles):
Good
2.9/100
NO2 (nitrogen dioxide):
Good
11.7/100
O3 (ozone):
Fair
36.4/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
6.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 09:00
AQI:
Fair
29.7/100
PM2.5 (fine particles):
Good
8.1/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
14.3/100
O3 (ozone):
Fair
29.7/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.9/100
PM1 (ultrafine particles):
Good
6.7/100
Pollen forecast in Saint John
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Saint John
Sports venues in Saint John
Frequently Asked Questions
Is air quality bad in Saint John right now?
On 16 July 2026, overall air quality in Saint John is fair. AQI is the main air quality indicator at 36.4/100. Pollution peaks around 8:00 AM (O3: 36.4/100).
Will air quality be worse tomorrow in Saint John?
On 17 July 2026, air quality conditions in Saint John will be similar to today, with AQI forecast at fair at 29.7/100. Pollution peaks around 9:00 AM (O3: 29.7/100).
When is air pollution at its worst in Saint John?
Saint John's air quality shifts with the calendar, largely because of its Irving Oil refinery and Bay of Fundy fog. Air quality here tends to dip in summer, when heat and industrial output combine, and again briefly in winter when cold, calm air traps emissions near ground level. Wind direction along the river has a strong influence on which neighbourhoods feel the effects most on any given day.
Are air quality levels in Saint John 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.
Check air quality in other popular cities:
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