A year after the devastating Los Angeles-area wildfires -- which killed at least 31 people and destroyed more than 16,000 structures over three weeks -- researchers who have been assessing the disaster's health impacts are taking stock of what they've learned, and of the work that lies ahead.

A prominent advocate for 9/11 victims is cautioning that last year's devastating Palisades fire could lead to deadly respiratory illnesses for thousands -- in a crisis as big as the aftermath of the 2001 terrorist attacks in New York City.