Billoi Wrote:
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> Air sampler. They're in a quite a few Metro
> stations. They showed up not long after 9-11.
Yup, that's what I thought though Google Image Search (by image) didn't turn up anything interesting UNTIL I used your words "air sampler" as an additional search "term" with the image:
http://www.lanl.gov/quarterly/q_spring03/basis_text.shtml