Fourier spectra of methyl chloride have been obtained at ambient laboratory temperature under self-broadening conditions. Five thousand two hundred and sixty rovibrational transitions of the (nu2, nu5, 2nu3)-vibrational-band triad have been assigned, and new ground and excited state rotational constants for CH335Cl and CH327Cl have been determined. The nu5 and nu2 vibrational-band intensities are determined to be, respectively, 42(1.2) and 31.7(0.9) cm-2 atm-1. Self-broadening coefficients of individual rovibrational lines are determined for the nu5 band of CH335Cl and CH337Cl at 296 K. The self-broadening coefficients peak broadly close to the maximum in the Boltzmann rotational population; no specific trends of the broadening coefficients are observed with the rotational quantum number K. With the exception of the RQ(J, 0) branch, the 1260-1650 cm-1 spectral region can be well modeled by the superposition of overlapping Voigt line profiles. To adequately model the densely packed RQ(J, 0) branch, however, we included collisional line mixing with A+ to A- in addition to A- to A- and A+ to A+ |DeltaJ| >/= 1, DeltaK = 0 collisional transitions allowed. Copyright 1998 Academic Press.