What is the air quality trend in Gilroy?

Over the past 15 days, Gilroy had an average AQI of 27 based on station measurements. The worst day was 2026-10-09 with AQI 40.

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

334h

PM2.5 Station

334h · 44 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	21	20–23	5.0 µg/m³	10h	47
2026-10-20	23	18–55	5.7 µg/m³	24h	43
2026-10-19	29	22–67	7.1 µg/m³	24h	46
2026-10-18	27	16–32	6.5 µg/m³	24h	43
2026-10-17	23	21–27	5.5 µg/m³	24h	47
2026-10-16	26	22–40	6.3 µg/m³	24h	45
2026-10-15	29	25–36	6.9 µg/m³	24h	46
2026-10-14	22	19–33	5.4 µg/m³	24h	48
2026-10-13	24	21–35	5.9 µg/m³	24h	47
2026-10-12	25	21–29	6.0 µg/m³	24h	48
2026-10-11	27	25–29	6.5 µg/m³	24h	47
2026-10-10	31	24–42	7.4 µg/m³	24h	43
2026-10-09	40	29–54	9.6 µg/m³	24h	44
2026-10-08	32	27–36	7.8 µg/m³	24h	48
2026-10-07	33	28–38	8.0 µg/m³	12h	48

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