What is the air quality trend in Chilliwack-Downtown?

Over the past 15 days, Chilliwack-Downtown had an average AQI of 38 based on station measurements. The worst day was 2026-10-20 with AQI 50.

How is Chilliwack-Downtown air quality measured?

Air quality in Chilliwack-Downtown 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 Chilliwack-Downtown, Canada

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

Historical PM2.5 and AQI trend from monitoring stations near Chilliwack-Downtown, Canada.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

332h

PM2.5 Station

332h · 9 stations

Temperature GFS model

55pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	23	17–27	5.5 µg/m³	4h	11
2026-10-20	50	15–167	16.2 µg/m³	24h	8
2026-10-19	43	17–98	11.6 µg/m³	24h	6
2026-10-18	44	14–165	13.5 µg/m³	24h	6
2026-10-17	41	15–160	12.1 µg/m³	24h	8
2026-10-16	39	16–89	10.4 µg/m³	24h	7
2026-10-15	43	20–101	11.4 µg/m³	24h	8
2026-10-14	48	23–95	13.0 µg/m³	24h	9
2026-10-13	47	17–159	13.9 µg/m³	24h	9
2026-10-12	28	14–55	6.8 µg/m³	24h	8
2026-10-11	34	16–70	8.5 µg/m³	24h	9
2026-10-10	34	15–71	8.7 µg/m³	24h	8
2026-10-09	37	15–114	9.7 µg/m³	24h	8
2026-10-08	36	19–64	8.7 µg/m³	24h	4
2026-10-07	30	13–57	7.3 µg/m³	16h	4

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