Records shed new light on what officials knew about post-9/11 air quality.
Kilauea, a volcano in Hawaii, began erupting on Tuesday morning, releasing large volcanic particles into the air, according to officials.
Dense Tule fog has settled across the valley floor for several weeks this season, reducing visibility and contributing to dangerous driving conditions, including pileup crashes on Highway 99.
The fog is affecting people across the Valley from limited visibility on the roads to impacts on air quality.
Despite hazy skies, people took advantage of the cooling temperatures in the evening to enjoy Woodward Park.
Medical experts say it's important to prioritize your health, especially with the lingering haze and the changing season.