What is the air quality trend in Hercules?

Over the past 14 days, Hercules had an average AQI of 26 based on station measurements. The worst day was 2026-05-21 with AQI 40.

How is Hercules air quality measured?

Air quality in Hercules 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 Hercules, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Hercules, 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 · 101 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-29	19	14–23	4.5 µg/m³	4.2	23h	101
2026-05-28	23	14–50	5.5 µg/m³	3.7	24h	93
2026-05-27	22	20–28	5.3 µg/m³	3.2	24h	103
2026-05-26	21	16–28	5.1 µg/m³	3.8	24h	103
2026-05-25	19	15–26	4.5 µg/m³	1.8	24h	102
2026-05-24	20	17–24	4.9 µg/m³	1.4	24h	103
2026-05-23	27	23–58	6.6 µg/m³	2.9	24h	103
2026-05-22	30	27–37	7.3 µg/m³	4.1	24h	100
2026-05-21	40	32–47	9.7 µg/m³	13.0	24h	103
2026-05-20	37	26–41	8.9 µg/m³	11.4	24h	103
2026-05-19	29	20–34	6.9 µg/m³	13.5	24h	103
2026-05-18	19	16–23	4.5 µg/m³	4.1	24h	101
2026-05-17	34	26–39	8.1 µg/m³	7.6	24h	102
2026-05-16	35	29–41	8.5 µg/m³	8.9	23h	101

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