Worst air pollution St. John's, today and tomorrow
Today (16 July): Air quality in St. John's is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:30 AM (O3: 51.8/100).
Tomorrow (17 July 2026): Air quality in St. John's is medium. All 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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St. John's air quality benefits from near-constant North Atlantic winds ventilating this harbour city, with fishing-fleet and container-port traffic the primary local sources amid otherwise clean maritime air.
Today - 16 July | Pollution peaks at 08:30
AQI:
Medium
51.8/100
PM2.5 (fine particles):
Good
9.4/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
51.8/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Good
11.6/100
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
5.5/100
PM10 (coarse particles):
Good
1.6/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
44.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
7.0/100
Air quality forecasts for neighbourhoods and landmarks in St. John's
Sports venues in St. John's
Frequently Asked Questions
Is air quality bad in St. John's right now?
On 16 July 2026, overall air quality in St. John's is medium. AQI is the main air quality indicator at 51.8/100. Pollution peaks around 8:30 AM (O3: 51.8/100).
Will air quality be worse tomorrow in St. John's?
On 17 July 2026, air quality conditions in St. John's will be similar to 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 St. John's?
St. John's air quality rises and falls with the seasons, shaped by its steep harbourside setting on the Avalon Peninsula. Wind and fog off the North Atlantic dominate the local climate, generally keeping the air remarkably clean apart from the rare calm, still day. Storm systems roll through often enough that pollution seldom has time to build up.
Are air quality levels in St. John's 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