Fire damage assessment identifies char residue distribution, black carbon penetration, and ash particles, released during burning of synthetic materials, furniture, and building components. Corrosive anion analysis evaluates contamination on electrical and mechanical surfaces that can cause equipment failures months after the incident. These contaminants pose health risks including respiratory problems from residual particles and ongoing exposure to toxic combustion byproducts. The microscopic nature of these contaminants allows them to penetrate deep into materials and circulate through HVAC systems, creating widespread contamination that cleaning without proper assessment may miss.