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

Over the past 7 days, St. John's had an average AQI of 48 based on station measurements. The worst day was 2026-07-18 with AQI 63.

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.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

122h

PM2.5 Station

122h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	31	1–151	8.8 µg/m³	15h	2
2026-07-20	34	7–65	8.5 µg/m³	19h	2
2026-07-19	45	13–152	12.8 µg/m³	18h	2
2026-07-18	63	15–242	26.3 µg/m³	18h	2
2026-07-17	50	9–165	15.6 µg/m³	20h	2
2026-07-16	60	17–185	21.8 µg/m³	16h	2
2026-07-15	54	14–163	17.4 µg/m³	16h	2

Back to St. John's Air Quality