SEM Images showing dust distribution

Scanning Electron Micrographs (200x magnifications) showing dust distribution in the top, middle and bottom layers of a new residential carpet. The images show the carpet layers before and after contamination with ATD (Allergen Test Dust), followed by cleaning consisting of vacuuming and hot water extraction.

  Top Middle Bottom
Before Dust Contamination top-before-adt middle-before-adt bottom-before-adt
After ATD Introduction top-after-adt middle-after-adt bottom-after-adt
After Cleaning top-after-cleaning middle-after-cleaning bottom-after-cleaning

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