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Haze and smoke will persist through the foothills and the valley. Smoke from the Sequoia NF wildfires (the KNP Complex and the Windy Fire) is spreading northward into/over our area today and then northeastward tonight as winds transition from northerly to southerly and then southwesterly, according to the NWS Sacramento.

https://yubanet.com/wp-content/uploads/2021/09/0921.mp4
This is an experimental smoke forecast model and may not be available at all times.  It is also NOT an official air quality forecast.  The official Air Quality forecast for California can be found here:  AirNow (fire.airnow.gov)