We consider here the algorithms for reconstruction of gas concentrations in multicomponent gas mixtures. The algorithms of signal processing for differential absorption laser photoacoustic experiments derived from regularized solutions of ill-posed inverse problems are described. Results of numerical simulations of reconstruction of concentrations in multicomponent gas mixtures and those for processing signals of laser photoacoustic gas analyzer are presented. It is shown that the use of regularizing procedures for data processing provides for low errors in reconstruction of gas concentration at different methods of selecting regularization parameter. In many cases, selection of regularization parameter on a basis of modified concept of discrepancy gives smoothing of errors which can be caused by the selection of regularization parameter on the basis of the principle of discrepancy or by that of quasioptimal value of the parameter.