What is the air quality trend in San Luis Obispo?

Over the past 8 days, San Luis Obispo had an average AQI of 42 based on station measurements. The worst day was 2026-07-15 with AQI 56.

How is San Luis Obispo air quality measured?

Air quality in San Luis Obispo 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 Luis Obispo, United States

Name: San Luis Obispo 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 Luis Obispo, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

147h

PM2.5 Station

147h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	17	17–17	4.1 µg/m³	1h	1
2026-07-21	49	7–106	13.9 µg/m³	20h	1
2026-07-20	44	22–76	11.6 µg/m³	20h	2
2026-07-19	44	20–95	11.7 µg/m³	21h	2
2026-07-18	45	10–102	11.9 µg/m³	20h	2
2026-07-17	40	12–63	9.8 µg/m³	23h	2
2026-07-16	41	13–65	10.3 µg/m³	22h	2
2026-07-15	56	9–93	16.5 µg/m³	20h	2

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