We measured total sulfur, hydrogen sulfide, hydrocarbons, and nitrogen in the off-gases from the Lawrence Livermore national Laboratory's 6-tonne/day Rubble In Situ Extraction Simulation facility with a series of on-line, gas-monitoring instruments and gas indicator tubes. In addition, using instrumental neutron activation analysis after collection in adsorbent traps r in filter and impactor samplers, we determine the concentrations of several trace elements in the off-gas vapors and in aerosol mists. The concentrations of hydrocarbons in the vapor and in the product oil were determined either by on-line gas chromatography and off-line gas chromatography, or off-line gas chromatography coupled with mass spectroscopy. The assembled data are used to estimate production factors for potential pollutants for use in developing emission control options and assessment of air quality.