Solid phase micro extn. and GC-MS were used for detn. of odor compds. in gas samples taken from an industrial piggery atm. Eight com. stationary phases were tested. The std. mixts. of odor compds. were generated by evapn. of resp. compounds into a gas stream at 30 degrees C. The detd. concns. of PhH and its alkyl deriv. were 10-25 ppm, of Cl-contg. org. compds. 5-10 ppm, Me(3)N 25 ppm, BuOH 50 ppm and (MeS)(2) 10 ppm.