The paper by Chen (2003) is a follow-up of an earlier paper by Chen and Fryrear (2001) on the aerodynamic and geometric diameters of airborne particles. A discussion of the first paper (Le Roux 2002), pointed out various discrepancies in the data, suggesting that the experimental setup may have been flawed. Unfortunately, the response by Chen and Fryrear (2002) left most of these issues unresolved, and similar discrepancies now surface in Chen (2003). This discussion therefore refers partly to the original Chen and Fryrear (2001) paper, the discussion by Le Roux (2002), and the reply by...

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