What is the air quality trend in Sarnia?

Over the past 21 days, Sarnia had an average AQI of 40 based on station measurements. The worst day was 2026-05-10 with AQI 164.

How is Sarnia air quality measured?

Air quality in Sarnia 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 Sarnia, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

470h

PM2.5 Station

470h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	33	12–158	9.9 µg/m³	24h	2
2026-05-29	29	14–82	7.6 µg/m³	22h	2
2026-05-28	20	6–62	5.0 µg/m³	22h	2
2026-05-27	36	4–135	9.9 µg/m³	23h	2
2026-05-26	43	18–111	11.9 µg/m³	24h	2
2026-05-25	44	13–197	18.4 µg/m³	24h	2
2026-05-24	38	12–153	10.7 µg/m³	24h	2
2026-05-23	18	5–68	4.6 µg/m³	23h	2
2026-05-22	26	11–68	6.5 µg/m³	24h	2
2026-05-21	20	3–62	5.0 µg/m³	24h	2
2026-05-20	23	5–75	5.8 µg/m³	24h	2
2026-05-19	34	14–81	8.8 µg/m³	23h	2
2026-05-18	44	20–56	10.7 µg/m³	24h	2
2026-05-17	51	25–113	13.6 µg/m³	22h	2
2026-05-16	37	14–140	9.8 µg/m³	22h	2
2026-05-15	29	10–93	7.4 µg/m³	24h	3
2026-05-14	38	10–101	10.1 µg/m³	24h	3
2026-05-13	38	12–72	9.8 µg/m³	24h	3
2026-05-12	33	8–81	8.7 µg/m³	24h	3
2026-05-11	43	5–166	13.3 µg/m³	24h	3
2026-05-10	164	164–164	80.7 µg/m³	1h	1

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