What is the air quality trend in Santa Ana?

Over the past 8 days, Santa Ana had an average AQI of 27 based on station measurements. The worst day was 2026-10-20 with AQI 36.

How is Santa Ana air quality measured?

Air quality in Santa Ana 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 Santa Ana, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Santa Ana, 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 · 116 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	36	23–52	8.5 µg/m³	4.9	19h	100
2026-10-19	29	22–36	7.0 µg/m³	2.8	24h	117
2026-10-18	25	14–34	5.9 µg/m³	1.5	24h	109
2026-10-17	25	16–33	6.0 µg/m³	0.7	24h	117
2026-10-16	26	15–35	6.2 µg/m³	0.7	24h	112
2026-10-15	27	16–37	6.4 µg/m³	1.9	24h	117
2026-10-14	26	19–30	6.1 µg/m³	1.6	24h	118
2026-10-13	25	24–26	5.9 µg/m³	1.9	3h	117

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