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

Over the past 20 days, St. John's had an average AQI of 47 based on station measurements. The worst day was 2026-07-12 with AQI 88.

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

309h

PM2.5 Station

309h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	28	5–84	7.5 µg/m³	16h	2
2026-07-20	29	1–88	7.6 µg/m³	17h	2
2026-07-19	44	11–169	14.0 µg/m³	22h	2
2026-07-18	50	1–168	16.0 µg/m³	17h	2
2026-07-17	61	7–195	22.4 µg/m³	20h	2
2026-07-16	73	13–268	29.8 µg/m³	20h	1
2026-07-15	64	20–163	21.2 µg/m³	16h	2
2026-07-14	47	12–166	15.1 µg/m³	15h	2
2026-07-13	34	5–84	8.6 µg/m³	18h	2
2026-07-12	88	9–381	58.9 µg/m³	16h	2
2026-07-11	53	12–107	14.9 µg/m³	14h	2
2026-07-10	44	5–95	11.9 µg/m³	13h	1
2026-07-09	39	14–95	11.1 µg/m³	13h	1
2026-07-08	59	23–216	22.5 µg/m³	15h	2
2026-07-07	26	3–73	6.6 µg/m³	13h	2
2026-07-06	39	17–80	10.7 µg/m³	9h	1
2026-07-05	30	5–72	7.9 µg/m³	12h	2
2026-07-04	38	10–172	12.6 µg/m³	19h	2
2026-07-03	51	12–167	17.5 µg/m³	17h	2
2026-07-02	44	12–99	12.4 µg/m³	7h	1

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