LA firefighters put out massive blazes. Now they worry that cancer might be smoldering inside them

The Palisades Fire in Los Angeles in January ranks as the second-most destructive wildfire in Southern California history, with more than 23,000 acres and 5,000 structures burned. So many structures burned simultaneously, with so many unknown contents: plastics in furniture, batteries in cars.

​ The Palisades Fire in Los Angeles in January ranks as the second-most destructive wildfire in Southern California history, with more than 23,000 acres and 5,000 structures burned. So many structures burned simultaneously, with so many unknown contents: plastics in furniture, batteries in cars. Read More Breaking News, Latest News and Videos | CNN