Worst air pollution Signal Hill - St. John's, today and tomorrow
Today (16 July): Air quality in Signal Hill 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 Signal Hill 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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Signal Hill's air quality is exceptionally clean given constant Atlantic winds over this exposed headland, well away from downtown traffic below.
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
Other Landmarks in St. John's
Sports venues in St. John's
Frequently Asked Questions
Is air quality bad in Signal Hill right now?
On 16 July 2026, overall air quality in Signal Hill 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 Signal Hill?
On 17 July 2026, air quality conditions in Signal Hill 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 Signal Hill?
Signal Hill's air quality rises and falls with the seasons, shaped by its exposed clifftop position above St. John's harbour. 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 Signal Hill 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