What is the air quality trend in Saint John?

Over the past 8 days, Saint John had an average AQI of 51 based on station measurements. The worst day was 2026-06-05 with AQI 79.

How is Saint John air quality measured?

Air quality in Saint John 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 Saint John, Canada

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

Historical PM2.5 and AQI trend from monitoring stations near Saint John, Canada.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

81h

PM2.5 Station

81h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	27	18–70	7.2 µg/m³	7h	2
2026-06-08	55	2–140	16.8 µg/m³	14h	2
2026-06-07	54	13–152	16.4 µg/m³	10h	2
2026-06-06	50	12–128	15.1 µg/m³	12h	2
2026-06-05	79	10–153	27.4 µg/m³	9h	2
2026-06-04	60	20–129	18.5 µg/m³	13h	1
2026-06-03	60	17–155	19.5 µg/m³	10h	2
2026-06-02	27	3–88	7.8 µg/m³	6h	1

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