A general set of orthogonal q-polynomials {P m (x); m = 0, 1, 2, …, N} is introduced and characterized by its three-term recursion relation. This set unifies many of the different known systems of orthogonal q-polynomials, e.g. the Stieltjes-Wigert polynomials and their several generalizations, the Brenke-Chihara polynomials, the Al Salam-Carlitz polynomials, the Al Salam-Chihara polynomials, …. Compact expressions of the moments of the asymptotical density of zeros of this global set of q-polynomials are explicitly found in terms of the coefficients of the three-term recurrence relation. As an example the asymptotical density of zeros of the known, above-mentioned systems of orthogonal q-polynomials are calculated through its moments.