Smoke contains fine particles that can travel deep into the lungs.
After an explosion and fire at a Chevron refinery in El Segundo on Thursday night, air quality is top of mind for many. Eyewitness News spoke with a pulmonologist on how to stay safe.
Smoke and ash from three wildfires burning in Southern California prompt a smoke advisory from the South Coast Air Quality Management District.
At least 738 wildfires are currently burning in Canada, with at least 201 out of control, according to the Canadian Interagency Forest Fire Centre.
A massive cloud of dust from the Sahara Desert is blanketing most of the Caribbean in the biggest event of its kind this year as it heads toward the United States.
With allergy season getting longer and more severe, some patients are turning to a procedure known as balloon sinuplasty for relief.