What is the air quality trend in Tustin?

Over the past 14 days, Tustin had an average AQI of 43 based on station measurements. The worst day was 2026-05-20 with AQI 70.

How is Tustin air quality measured?

Air quality in Tustin 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 Tustin, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

336h

PM2.5 Station

336h · 2 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-28	18	3–38	4.4 µg/m³	0.9	24h	100
2026-05-27	22	19–35	5.3 µg/m³	1.5	24h	114
2026-05-26	24	23–26	5.7 µg/m³	2.9	24h	114
2026-05-25	27	25–34	6.6 µg/m³	3.7	24h	114
2026-05-24	38	32–43	9.2 µg/m³	8.2	24h	115
2026-05-23	47	40–51	11.2 µg/m³	9.0	24h	114
2026-05-22	50	28–58	12.3 µg/m³	9.3	24h	110
2026-05-21	51	44–58	12.5 µg/m³	9.3	24h	115
2026-05-20	70	51–85	21.2 µg/m³	16.0	24h	114
2026-05-19	68	58–76	20.3 µg/m³	13.6	24h	114
2026-05-18	62	53–71	17.2 µg/m³	12.5	24h	115
2026-05-17	55	40–67	14.5 µg/m³	11.5	24h	114
2026-05-16	37	33–39	9.0 µg/m³	6.4	24h	113
2026-05-15	38	29–41	9.0 µg/m³	8.3	24h	108

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