What is the air quality trend in Gilroy?

Over the past 15 days, Gilroy had an average AQI of 30 based on station measurements. The worst day was 2026-07-16 with AQI 44.

How is Gilroy air quality measured?

Air quality in Gilroy 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 Gilroy, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

335h

PM2.5 Station

335h · 36 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	20	20–20	4.7 µg/m³	1h	36
2026-07-21	28	22–51	6.7 µg/m³	24h	38
2026-07-20	27	20–70	6.6 µg/m³	24h	37
2026-07-19	29	23–35	7.0 µg/m³	24h	39
2026-07-18	32	25–41	7.8 µg/m³	24h	39
2026-07-17	36	30–55	8.7 µg/m³	24h	38
2026-07-16	44	30–243	16.1 µg/m³	24h	38
2026-07-15	34	29–44	8.1 µg/m³	24h	38
2026-07-14	31	28–40	7.4 µg/m³	24h	37
2026-07-13	29	25–41	7.0 µg/m³	24h	38
2026-07-12	24	21–35	5.7 µg/m³	24h	36
2026-07-11	30	22–52	7.1 µg/m³	24h	31
2026-07-10	37	22–40	8.8 µg/m³	24h	37
2026-07-09	24	21–32	5.8 µg/m³	24h	38
2026-07-08	25	22–30	5.9 µg/m³	22h	40

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