This paper analyses the concept of Pollution-generating Technologies (PgT). Following the notion of output congestion, a suitable B-disposable assumption is introduced. This approach aims to reveal any PgT in production processes that are compatible with a minimal set of assumptions. Thus, a more general class of PgT (convex and non-convex) is defined. An empirical illustration is proposed to give an illustrative example of the new B-disposal assumption with respect to convex and non-convex non-parametric technologies.