Worst air pollution Cowan Heights - St. John's, today and tomorrow
Today (16 July): Air quality in Cowan Heights is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:30 AM (O3: 51.8/100).
Tomorrow (17 July 2026): Air quality in Cowan Heights is medium. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 11:30 AM (O3: 44.2/100). 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
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Cowan Heights's air quality reflects its residential position, with Elizabeth Avenue traffic the modest primary local source.
Today - 16 July | Pollution peaks at 08:30
AQI:
Medium
51.8/100
PM2.5 (fine particles):
Good
12.0/100
PM10 (coarse particles):
Good
4.1/100
NO2 (nitrogen dioxide):
Fair
22.3/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Good
14.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 11:30
AQI:
Medium
44.2/100
PM2.5 (fine particles):
Good
7.0/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Good
8.9/100
O3 (ozone):
Medium
44.2/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
9.0/100
Other Landmarks in St. John's
Sports venues in St. John's
Frequently Asked Questions
Is air quality bad in Cowan Heights right now?
On 16 July 2026, overall air quality in Cowan Heights is fair. NO2 is the main pollutant at 22.3/100. Pollution peaks around 8:30 AM (O3: 51.8/100).
Will air quality be worse tomorrow in Cowan Heights?
On 17 July 2026, air quality conditions in Cowan Heights will be better than today, with AQI forecast at medium at 44.2/100. Pollution peaks around 11:30 AM (O3: 44.2/100).
When is air pollution at its worst in Cowan Heights?
Cowan Heights sees clear seasonal swings in air quality, driven in part by its hillside suburban streets in St. John's. Frequent storms and fog off the North Atlantic keep pollution levels low year-round, with occasional calm summer days the only time local emissions can briefly build up. Storm systems roll through often enough that pollution seldom has time to build up.
Are air quality levels in Cowan Heights 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