This report describes recent work performed at The Aerospace Corporation to determine the capability of the COT laser photoacoustic technique to detect the rocket fuels hydrazine, monomethylhydrazine (MM4), and unsymmetrical dimethylhydrazine (UDHE) at low parts-per-billion (ppb) levels in the ambient air in real time. These compounds are highly toxic and recent studies indicate that they may also be carcinogens. Revised OempaIeional Safety and Reaith-*dmlnistration (OSgA) regu-lationa are expected that will reduce the maximum allowable concentrations of Do