The invention concerns a method for air distillation with production of argon using an air distilling installation (1) comprising an air distilling apparatus (2) in particular with double column, and at least one column for producing impure argon, the installation having dimensions for supplying argon with a nominal yield rho n of argon extraction at the impure argon producing column output. For reduced argon production requirements corresponding to a required yield rho of argon extraction at the impure argon producing column output, with rho