The primary objective of the NASA Earth Science Division is to determine how the global environment is changing, what drives these changes, and the potential consequences for human civilization. In order to better research atmospheric properties, NASA requires instrumentation that is capable of measuring several key gaseous species, including OCS, CO2, CO, and H2O. Carbonyl sulfide (OCS) is currently monitored by both remote sensing and extractive sampling. As a complement to and validation of these remote systems, NASA has conducted several airborne campaigns to obtain higher resolution OCS measurements. For example, both the INTEX-NA and Transport and Chemical Evolution over the Pacific (TRACE-P) campaigns acquired canisters of ambient air samples at frequent intervals (e.g. 1 5 minutes) for off-line laboratory analysis. As researchers become more aware of the role of OCS in stratospheric aerosol formation and its potential as a carbon cycle tracer for photosynthesis, NASA requires new technologies that make stand-alone, in-situ measurements of OCS with faster time response (e.g. 1 Hz) and comparable accuracy aboard both airborne and terrestrial platforms. Additional measurements of CO2, CO, and H2O are also necessary to provide information on carbon dioxide respiration (e.g. OCS/CO2 ratio), combustion emissions (e.g. CO), and dry-mole fractions (e.g. correction for water vapor). Besides its importance to NASA, the development of a highly sensitive, mid-infrared trace gas analyzer has several commercial applications. In Phase III, LGR will target two potential markets for products resulting from the SBIR analyzer: environmental research laboratories and isotope measurement laboratories. A preliminary market analysis suggests 5-year revenue of $8 $15M for these two markets alone.