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

Over the past 15 days, St. John's had an average AQI of 44 based on station measurements. The worst day was 2026-06-05 with AQI 71.

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

213h

PM2.5 Station

213h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	43	15–83	12.4 µg/m³	5h	2
2026-06-08	40	8–157	12.6 µg/m³	16h	2
2026-06-07	56	10–284	25.1 µg/m³	17h	2
2026-06-06	42	9–163	13.1 µg/m³	15h	1
2026-06-05	71	20–153	22.7 µg/m³	10h	1
2026-06-04	46	15–108	13.4 µg/m³	13h	1
2026-06-03	41	8–78	11.8 µg/m³	9h	1
2026-06-02	32	1–85	8.4 µg/m³	10h	2
2026-06-01	32	7–91	8.8 µg/m³	17h	2
2026-05-31	33	10–91	8.6 µg/m³	21h	2
2026-05-30	46	11–143	13.9 µg/m³	18h	2
2026-05-29	42	15–112	11.4 µg/m³	20h	2
2026-05-28	38	17–86	10.6 µg/m³	15h	2
2026-05-27	55	4–190	20.8 µg/m³	17h	2
2026-05-26	45	7–97	12.5 µg/m³	10h	2

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