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

Over the past 21 days, St. John's had an average AQI of 52 based on station measurements. The worst day was 2026-05-10 with AQI 126.

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

280h

PM2.5 Station

280h · 2 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	26	7–80	6.8 µg/m³	13h	2
2026-05-29	38	3–126	10.5 µg/m³	16h	2
2026-05-28	35	12–163	11.4 µg/m³	13h	2
2026-05-27	73	12–251	31.4 µg/m³	13h	2
2026-05-26	83	12–339	40.5 µg/m³	19h	2
2026-05-25	46	4–168	15.0 µg/m³	16h	1
2026-05-24	49	6–155	15.6 µg/m³	14h	2
2026-05-23	24	13–58	6.1 µg/m³	7h	1
2026-05-22	60	10–155	20.0 µg/m³	11h	1
2026-05-21	62	3–215	27.8 µg/m³	12h	2
2026-05-20	70	20–166	25.6 µg/m³	8h	1
2026-05-19	85	13–192	40.7 µg/m³	6h	1
2026-05-18	41	15–118	12.3 µg/m³	7h	1
2026-05-17	39	6–95	12.3 µg/m³	5h	1
2026-05-16	39	10–80	10.3 µg/m³	20h	2
2026-05-15	39	8–132	10.9 µg/m³	21h	2
2026-05-14	35	11–152	9.8 µg/m³	19h	2
2026-05-13	40	9–105	11.3 µg/m³	20h	3
2026-05-12	51	9–125	14.8 µg/m³	22h	2
2026-05-11	49	20–163	14.8 µg/m³	17h	3
2026-05-10	126	126–126	45.6 µg/m³	1h	2

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