What is the air quality trend in Westmont?

Over the past 8 days, Westmont had an average AQI of 31 based on station measurements. The worst day was 2026-10-20 with AQI 52.

How is Westmont air quality measured?

Air quality in Westmont 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 Westmont, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Westmont, United States.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 285 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	52	23–70	13.6 µg/m³	1.0	20h	246
2026-10-19	28	21–40	6.7 µg/m³	3.4	24h	286
2026-10-18	23	18–35	5.4 µg/m³	—	24h	262
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	284
2026-10-16	19	11–39	4.5 µg/m³	1.1	24h	272
2026-10-15	24	14–40	5.7 µg/m³	1.6	24h	285
2026-10-14	39	18–54	9.4 µg/m³	2.4	24h	284
2026-10-13	50	49–50	11.9 µg/m³	1.1	2h	285

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