Personal nanoparticle respiratory depositions sampler and methods of using the same

A personally portable nanoparticle respiratory deposition (NRD) sampler configured to collect nanoparticles based upon a sampling criterion. In an aspect, the NRD sampler has an impactor stage, and a diffusion stage. In another aspect, the NRD sampler includes a particle size separator in addition to an impactor stage and a diffusion stage.