You will need:
Bore a 1-inch diameter hole through the bottom of each cup. Make sure that the holes are aligned. This will produce a spot with an area of approximately 5 square centimeters.
Next, cut a ring of cardboard with a centered, 1-inch diameter hole. This will act as a filler. Invert one cup, and put it on top of the hole.
Select a suitable mesh screen to support the filter, and cut it into a disk that will fit into the bottom of a cup. Put it on top of the cardboard filler.
Put the second cup on top of the first one.
Assemble as illustrated.
Position this sampler onto the hose of the vacuum cleaner. A tight seal should be produced when the vacuum is turned on. Put the tissue over the open end-hole; the suction will hold it on.
Run the vacuum cleaner for approximately 20 minutes with the sampler in place. Remove the tissue filter after the sample has been run. Measure air volume and black carbon density according to instructions for analysis provided.
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