What is the air quality trend in Hermosa Beach?

Over the past 14 days, Hermosa Beach had an average AQI of 29 based on station measurements. The worst day was 2026-10-08 with AQI 41.

How is Hermosa Beach air quality measured?

Air quality in Hermosa Beach 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 Hermosa Beach, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Hermosa Beach, 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 · 221 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	33	23–45	7.8 µg/m³	4.9	23h	198
2026-10-19	27	21–32	6.5 µg/m³	4.2	24h	226
2026-10-18	24	17–30	5.7 µg/m³	3.7	24h	209
2026-10-17	22	16–26	5.1 µg/m³	3.8	24h	225
2026-10-16	22	15–31	5.2 µg/m³	3.8	24h	215
2026-10-15	24	16–30	5.7 µg/m³	4.2	24h	225
2026-10-14	23	18–25	5.5 µg/m³	3.7	24h	226
2026-10-13	22	19–25	5.3 µg/m³	3.2	24h	225
2026-10-12	23	18–29	5.4 µg/m³	3.6	24h	224
2026-10-11	33	29–37	7.9 µg/m³	7.4	24h	226
2026-10-10	39	24–48	9.4 µg/m³	8.1	24h	201
2026-10-09	38	28–46	9.1 µg/m³	7.6	24h	210
2026-10-08	41	30–49	9.9 µg/m³	6.1	24h	229
2026-10-07	36	25–43	8.6 µg/m³	4.5	23h	219

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