What is the air quality trend in Westmount?

Over the past 15 days, Westmount had an average AQI of 19 based on station measurements. The worst day was 2026-05-19 with AQI 52.

How is Westmount air quality measured?

Air quality in Westmount 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 Westmount, Canada

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

303h

PM2.5 Station

303h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-30	10	4–13	2.5 µg/m³	1.2	4h	2
2026-05-29	22	2–65	5.7 µg/m³	5.1	24h	3
2026-05-28	12	2–70	3.0 µg/m³	2.7	22h	2
2026-05-27	11	3–39	2.5 µg/m³	1.2	21h	3
2026-05-26	27	6–46	6.5 µg/m³	3.7	24h	3
2026-05-25	15	2–27	3.3 µg/m³	2.0	15h	2
2026-05-24	18	3–76	4.7 µg/m³	3.9	24h	3
2026-05-23	24	3–89	6.3 µg/m³	4.8	24h	3
2026-05-22	9	1–39	2.2 µg/m³	1.4	22h	2
2026-05-21	10	1–38	2.4 µg/m³	1.5	15h	2
2026-05-20	25	2–46	6.0 µg/m³	3.6	19h	3
2026-05-19	52	9–135	14.9 µg/m³	7.4	24h	3
2026-05-18	14	1–47	3.4 µg/m³	2.5	23h	2
2026-05-17	30	1–83	8.2 µg/m³	4.4	24h	2
2026-05-16	11	3–35	2.5 µg/m³	1.1	18h	3

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