The primary NASA need for this technology is to measure PM light absorption at different altitudes for its Airborne Measurement program. At present, PM absorption is measured by collecting sample on a filter subtract and measuring light extinction and scattering of the collected samples during the airborne measurements. This method suffers from a number of intrinsic errors such as low sensitivity, ambient-pressure sampling and scattering light interference. The proposed DPAS technique will be far more sensitive than the filter-based techniques, and is capable of sampling at different pressures and providing 1s data acquisition measurement on absorption. In addition, emissions of small particulates (PM10 and PM2.5) are regulated by the EPA. The impact of particulate emissions from aircraft engines, which have a direct effect on radiative forcing, is magnified by the fact they are typically emitted in the upper troposphere and lower stratosphere where their influence is greatest. Past NASA programs such as EXCAVATE, APEX, UNA-UNA, and AAFEX have had as a major focus of their work, the measurement of black carbon (BC) emissions from civilian aircraft engines. The proposed DPAS PM absorption monitor can be used as a BC emission monitor to provide a cost-efficient, compact, fast and real-time BC measurement on aircraft engines.