Wildfire ash carries many carcinogens that could cause short- and long-term health problems, including asthma attacks and difficulty breathing.

Los Angeles is now a week removed from the day that multiple devastating wildfires erupted to torch tens of thousands of acres. But still, the question remains if people should wear masks to limit their exposure to toxins in the air.

A dust and ash advisory has been issued for L.A. County until 7 p.m. Wednesday "due to harmful particle pollution levels from windblown dust and ash."