What is the air quality trend in St. John's?

Over the past 3 days, St. John's had an average AQI of 40 based on station measurements. The worst day was 2026-06-07 with AQI 57.

How is St. John's air quality measured?

Air quality in St. John's is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for St. John's, Canada

Name: St. John's Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near St. John's, Canada.

118

Current AQI
Unhealthy for sensitive groups Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

29h

PM2.5 Station

29h · 3 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	32	15–66	8.4 µg/m³	4h	3
2026-06-08	33	8–71	9.0 µg/m³	15h	2
2026-06-07	57	9–146	18.3 µg/m³	10h	2

Back to St. John's Air Quality