CMAQv5.3.2-hyd is a hyperdual-step-enabled version of the Community Multiscale Air Quality Model. This augmented model can compute first- and second-order source-oriented sensitivities to machine precision. The Version5.3.2-hyd1.1 further resolves computational instability of the model by including some compromises: 1) The sensitivities from a specific reverse ISORROPIA subroutine, CALCL9, are ignored. No sensitivities from this specific subroutine contributes to the overall sensitivity of the model. 2) The sensitivities from the aqueous chemistry in clouds are ignored due to potential numerical instability. 3) The sensitivities from the photolysis module are ignored because they will minimally affect the concentration to emission relationship.