<i>Notes from the Field:</i> Serum Concentrations of Perfluoroalkyl and Polyfluoroalkyl Substances Among First Responders to the Maui Wildfires — Hawaii, September 2023

The United States is currently experiencing higher fire activity than in past years with an increase of the acreage burned, and that includes more destructive wildland urban-rural interface fires, potentially exposing first responders and communities to hazardous chemicals in the air and debris (1).Exposures to perfluoroalkyl and polyfluoroalkyl substances (PFAS), which are present in fire effluents, PFAS-containing dust, some firefighting foams, protective clothing worn by firefighters, and contaminated gear or equipment, are associated with cancer, cholesterol level changes, and other adverse health outcomes (2).Wildfires in Maui, Hawaii in August 2023 destroyed thousands of structures, vehicles, and parcels of land (3), and 102 persons lost their lives.Maui County employees (firefighters, police, ocean safety officers, and public works employees) responded and engaged in fire suppression, structure protection, evacuation, water rescue, and urban search and rescue.This report describes first responders' exposures to PFAS as measures after responding to those fires.