The Advanced Monitoring Systems (AMS) Center, one of six technology centers under ETV, is operated by Battelle in cooperation with EPA’s National Exposure Research Laboratory. The AMS Center has recently evaluated the performance of continuous monitors used to measure fine particulate mass and species in ambient air. This verification statement provides a summary of the test results for the EcoChem Analytics Photoelectric Aerosol Sensor (PAS) 2000 particulate polycyclic aromatic hydrocarbon (PAH) monitor.