What is the air quality trend in Rancho Santa Margarita?

Over the past 7 days, Rancho Santa Margarita had an average AQI of 35 based on station measurements. The worst day was 2026-05-22 with AQI 46.

How is Rancho Santa Margarita air quality measured?

Air quality in Rancho Santa Margarita 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 Rancho Santa Margarita, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Rancho Santa Margarita, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	22	14–32	5.2 µg/m³	23h	11
2026-05-27	26	18–42	6.2 µg/m³	24h	12
2026-05-26	28	22–41	6.7 µg/m³	24h	12
2026-05-25	34	24–50	8.0 µg/m³	24h	12
2026-05-24	46	35–56	11.2 µg/m³	24h	12
2026-05-23	44	35–53	10.6 µg/m³	24h	11
2026-05-22	46	23–75	11.6 µg/m³	23h	12

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