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The sampling of airborne particles in an environment is very important in assessing the risk to health of workers and many blunt sampling devices have been designed for this purpose. In this book sampling by aerodynamically blunt bodies is investigated mathematically for different situations. Existing approaches to the problem are described and improved upon. Also, a new approach is described which includes the use of the Boundary Integral Equation method. This method has advantages over other methods in that it makes it possible to consider samplers of various shapes with sampling taking place at arbitrary positions and includes the finiteness of the orifice in the model. One particular sampler, the human head, is investigated in detail. Also, using an analytical approach, the effects upon aspiration of the particle shape and the finite particle Reynolds number are investigated.