The MIDAC open path FTIR Air Monitoring System is compact, versatile, and rugged. Designed to detect, identify and measure a wide range of key contaminants simultaneously, it has been used in many different configurations to address a diverse list of applications. Analysis is onsite through a continuous sampling path of up to 1000 metres. Each system includes a rugged, sealed 0.5 cm-1 resolution interferometer equipped with a choice of beamsplitters and detectors. The analyzer is coupled to a control PC via standard ribbon cable or long-range fibre-optic link.