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A novel airborne particulate filtration medium, consisting of a two-tier composite structure, i.e., a nano-fiber/net (NFN) top layer and a conventional nonwoven microfibrous support, was demonstrated for highly efficient and low pressure drop filtration for the first time. The polyamide-66 (PA-66) NFN structured top layer, which is composed of traditional electrospun nanofibers and two-dimensional (2D) spider-web-like nano-nets, was electro-spinning/netting (ESN) deposited on the nonwoven polypropylene (PP) scaffold for constructing this new concept of filter. The morphology of NFN architecture, including fiber diameter, coverage rate, pore-width and layer-by-layer packing structure of the nano-nets, can be finely controlled by regulating the solution properties and several ESN process parameters. Taking advantage of several fascinating features such as extremely small diameter, high porosity, controllable coverage …