What is the air quality trend in Simi Valley?

Over the past 20 days, Simi Valley had an average AQI of 47 based on station measurements. The worst day was 2026-05-09 with AQI 87.

How is Simi Valley air quality measured?

Air quality in Simi Valley 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 Simi Valley, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

468h

PM2.5 Station

468h · 1 station

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	21	12–38	4.9 µg/m³	16h	1
2026-05-27	25	12–38	6.0 µg/m³	24h	1
2026-05-26	27	17–53	6.5 µg/m³	24h	1
2026-05-25	32	17–59	7.8 µg/m³	24h	1
2026-05-24	50	29–72	13.4 µg/m³	24h	1
2026-05-23	57	38–95	15.7 µg/m³	24h	1
2026-05-22	58	21–102	17.5 µg/m³	22h	1
2026-05-21	36	21–72	8.9 µg/m³	24h	1
2026-05-20	45	17–119	12.7 µg/m³	23h	1
2026-05-19	42	12–99	12.2 µg/m³	24h	1
2026-05-18	45	12–80	12.1 µg/m³	24h	1
2026-05-17	46	29–66	11.8 µg/m³	24h	1
2026-05-16	44	29–59	10.6 µg/m³	24h	1
2026-05-15	59	33–99	17.0 µg/m³	24h	1
2026-05-14	45	21–82	11.8 µg/m³	24h	1
2026-05-13	38	17–50	9.2 µg/m³	24h	1
2026-05-12	60	21–122	18.7 µg/m³	24h	1
2026-05-11	58	21–97	17.1 µg/m³	24h	1
2026-05-10	83	46–173	29.3 µg/m³	24h	1
2026-05-09	87	53–163	29.5 µg/m³	23h	1

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