Patent ID: 7574928

Claim:
A method of obtaining multiple air samples using a single air sampling device, said air sampling device comprising a cassette including a first inlet and a second inlet, the method comprising: a) drawing a first sample of air through said first inlet, while the second inlet is covered by a removable cap; b) collecting particulates contained in said first sample of air on a first collection structure; c) removing said cap from said second inlet: d) drawing a second sample of air through second inlet, while said first inlet is covered by a removable cap; e) collecting particulates contained in said second sample of air on a second collection structure; wherein the second sample of air is prevented from commingling with the particulates collected from said first sample of air prior to contact with the second collection structure; f) drawing said first sample of air past said first collection structure and out of said cassette through an outlet; and g) drawing said second sample of air past said second collection structure and out of said cassette through said outlet; wherein steps a) and d) occur sequentially.