Air Quality in San Luis Obispo, United States
Windy
23.2°C · 49.5% humidity
23.2°
Feels 23.2°
98
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
1 station
Nearby Monitoring Stations
San Luis Obispo's air quality — share it
AQI Forecast
34
12pm
34
34
98
3pm
80
67
58
6pm
51
46
43
9pm
40
38
37
12am
36
36
35
3am
35
35
27
6am
34
34
34
9am
34
34
Air Quality Index Trend
24h · 1 stnSan Luis Obispo's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in San Luis Obispo is 2.3× the WHO 24-hour guideline of 15 µg/m³.
49.5%
Humidity
48.1 km/h
Wind WNW
1006.6 hPa
Pressure
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
34.4 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for San Luis Obispo?
Temperature & Precipitation
PM2.5 Trend
24h · 1 stationPM2.534.4 µg/m³
×2.3 WHO
Moderate
PM1020.55 µg/m³
Good
UV INDEX24.9
Extreme
Station readings (1 station within 25 km)
34.4
Median
34.4
Average
34.4
Low
34.4
High
PM2.5 µg/m³ · Model: 7.35 · Bias: -27.0
What is the 7-day forecast for San Luis Obispo?
07-21
23.4° 14.5°
0.06 mm
07-22
24.9° 15.1°
07-23
21.9° 16.6°
07-24
23.3° 15.6°
0.06 mm
07-25
22.1° 15.4°
07-26
25.7° 15.0°
07-27
25.4° 15.1°
Both models agree
Avg diff: 3.7°C
Where are air quality stations near San Luis Obispo?
65
Atascadero-Lewis Avenue, San Luis Obispo, California
84
Atascadero-Lewis Avenue, San Luis Obispo, California
What cities are near San Luis Obispo?
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-07-21T22:51 UTC.