In this episode, Dr. Jones is joined by Dr. Michael Kleeman, Professor of Civil and Environmental Engineering at UC Davis, to discuss new research on metallic nanoparticles found after the January 2025 fires. They explore why particle size matters, how tiny particles can move through the body, and what scientists learned while studying dust from debris removal in urban burn areas. Dr. Kleeman explains the unexpected discovery of nanoparticle chromium and why burned homes, vehicles, electronics, artificial turf, and other materials may contribute to unusual air quality risks after a fire.