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A modified method of trapping ammonia and hydrogen sulfide for determining ammonia and hydrogen sulfide emission from manure storage facilities was developed and tested. This method used two stages of a two-trap series, each stage consisted of a vacuum trap followed by an adsorbing flask. The first stage contained 1 N sulfuric acid for selective absorption of ammonia and amines; and the second stage consisted of 0.1 N zinc acetate in 0.1 N sodium hydroxide solution to absorb and preserve the evolved hydrogen sulfide. Since the two trapping stages are arranged sequentially, ammonia and hydrogen sulfide can be measured simultaneously. Exhaust gases from the manure storage tank in the laboratory were sampled and then the trapping solutions were analyzed for ammonia, using distillation procedures, and for hydrogen sulfide, using the titration method. The new apparatus completely trapped the ammonia and hydrogen sulfide emitted, so is suitable, by adjusting the sampling time and air-flow rate, for measuring a wide range of emission concentrations. This method is simple to use and easy to operate in a laboratory, and can be possibly extended to field monitoring of ammonia and hydrogen sulfide emissions, which would provide a low cost quantification of odor-reducing practices in animal waste storage facilities.