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Beth,
No mystery, your frameshop would know the techniques, for those who care to employ them. (Not everyone will think it necessary.)
In framing a pastel, you would always use a mounting that kept the glass away from the artwork. This is done with a thin strip of wood or mat, hidden within the rabbet of the frame moulding, separating the glass from whatever the next layer is. If that next layer is the original artwork, then any loose particles will drop down and lie "invisibly" behind the rabbet of the lower moulding.
If you mat your artwork and still wanted this protection against unsightly accumulation of dropped particles, you would put those spacer strips between the glass and the mat, so that the fallen particles will not be trapped by the glass on the lower bevel cut of the mat opening.
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