Picarro’s Fenceline Monitoring System (FMS) is a fixed, perimeter-based monitoring system designed to deliver continuous, high-sensitivity measurements of hazardous air pollutants at industrial facility boundaries. Built on proven Cavity Ring-Down Spectroscopy (CRDS) technology, the system provides accurate, defensible data that supports regulatory compliance under the HON, RSR, and CMAS rules. When combined with Picarro’s cloud platform, mobile monitoring units, and expert services, the FMS forms the foundation of an integrated fenceline monitoring solution.