The aim of this paper is to extend the definition of motivic homotopy
theory from schemes to a large class of algebraic stacks and establish a
six functor formalism. The class of algebraic stacks that we consider
includes many interesting examples: quasiseparated algebraic spaces, local
quotient stacks and moduli stacks of vector bundles. We use the language of
-categories
developed by Lurie. Using the techniques developed by Ayoub, Gallauer and Vezzani,
we extend the six functor formalism from schemes to our class of algebraic stacks. We
also prove that the six functors satisfy properties like homotopy invariance,
localization and purity.