The purpose of the task reported here is to asses the possible air quality impact of codisposal. A preliminary estimate of nitrogenous heterocycle emissions during disposal and compaction was made by analyzing existing data and using certain explicit necessary assumptions that were generalized from published development plans. The assumptions were: shale moistened to 15% wt/wt; moisturization water is Oxy-6 gas condensate, which has been partially characterized in the literature; spent shale is compacted in 0.5 m lifts to a dry density of 85 lb/m3 immediately upon delivery to the site and remains uncovered for 24 h before another lift is emplaced; temperature of spent shale in the lift is 85C. Adsorption of N-heterocycles on spent shale was assumed insignificant. Biological reactions and vapor-phase photolysis are discussed but not included in the calculations.