What is the air quality trend in St. Marys?

Over the past 8 days, St. Marys had an average AQI of 42 based on station measurements. The worst day was 2026-06-04 with AQI 52.

How is St. Marys air quality measured?

Air quality in St. Marys 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. Marys, United States

Name: St. Marys 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. Marys, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

140h

PM2.5 Station

140h · 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	43	13–69	11.2 µg/m³	13h	2
2026-06-08	36	18–93	9.2 µg/m³	20h	2
2026-06-07	40	10–84	10.2 µg/m³	22h	2
2026-06-06	48	17–89	12.7 µg/m³	20h	2
2026-06-05	51	22–122	14.4 µg/m³	19h	1
2026-06-04	52	13–112	14.5 µg/m³	20h	1
2026-06-03	36	23–68	9.1 µg/m³	20h	2
2026-06-02	35	25–46	8.5 µg/m³	6h	2

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