What is the air quality trend in San Rafael?

Over the past 8 days, San Rafael had an average AQI of 37 based on station measurements. The worst day was 2026-10-18 with AQI 51.

How is San Rafael air quality measured?

Air quality in San Rafael 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 San Rafael, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

150h

PM2.5 Station

150h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	23	8–55	4.7 µg/m³	5.4	6h	1
2026-10-19	34	3–72	8.9 µg/m³	12.1	23h	1
2026-10-18	51	17–107	14.2 µg/m³	20.0	23h	1
2026-10-17	45	14–66	11.6 µg/m³	12.8	24h	2
2026-10-16	44	16–69	11.2 µg/m³	12.1	24h	2
2026-10-15	41	18–69	10.3 µg/m³	12.5	24h	2
2026-10-14	36	9–79	9.0 µg/m³	11.2	24h	2
2026-10-13	28	26–29	6.6 µg/m³	9.6	2h	2

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