Summary
The Los Angeles wildfires have destroyed over 12,000 structures and caused at least 24 deaths, while smoke poses a severe health threat.
Fine particulate pollution (PM2.5) from wildfire smoke, particularly toxic in urban fires due to burning synthetic materials, can deeply harm lungs and cause cumulative damage.
Vulnerable groups include those with pre-existing conditions, young children, and the unhoused.
Experts warn wildfire smoke is reversing progress on air quality, as climate change increases fire frequency.
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