What is the air quality trend in Hollister?

Over the past 20 days, Hollister had an average AQI of 30 based on station measurements. The worst day was 2026-07-16 with AQI 53.

How is Hollister air quality measured?

Air quality in Hollister 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 Hollister, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

455h

PM2.5 Station

455h · 25 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	29	21–75	7.1 µg/m³	24h	25
2026-07-20	30	20–100	7.8 µg/m³	24h	25
2026-07-19	28	23–35	6.8 µg/m³	24h	26
2026-07-18	32	25–42	7.8 µg/m³	24h	26
2026-07-17	40	32–68	9.7 µg/m³	24h	26
2026-07-16	53	30–405	24.4 µg/m³	24h	25
2026-07-15	38	32–55	9.1 µg/m³	24h	26
2026-07-14	34	29–52	8.1 µg/m³	24h	25
2026-07-13	31	25–55	7.6 µg/m³	24h	26
2026-07-12	24	20–41	5.7 µg/m³	24h	25
2026-07-11	28	9–51	6.7 µg/m³	24h	21
2026-07-10	38	30–51	9.2 µg/m³	24h	25
2026-07-09	25	21–36	5.9 µg/m³	24h	26
2026-07-08	26	23–35	6.3 µg/m³	24h	27
2026-07-07	22	16–99	5.8 µg/m³	24h	27
2026-07-06	19	17–21	4.5 µg/m³	12h	28
2026-07-05	30	18–59	7.4 µg/m³	24h	27
2026-07-04	22	18–30	5.3 µg/m³	24h	27
2026-07-03	27	23–31	6.4 µg/m³	24h	27
2026-07-02	28	21–35	6.7 µg/m³	11h	25

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