Chlorine Flush vs. IAQ Assessment

In concept, I don't think a chlorine flush would affect IAQ sampling. It definitely won't affect Path 1 items (Particulate matter, carbon monoxide or ozone). The VOC items in Path 2 are typically sampled with carbon (charcoal) or DNPH media. The carbon might capture chlorine/chloramines, but I don't think it would be a great bond. So it might affect your tVOC levels, but not the itemized analystics that LEED reviews. You should test for both tVOC and the indidual analytics at the same time though, to cover our bases. I don't think DNPH media (used for formaldehyde and other aldehydes) would capture anything. Give me a shout if you have any further questions at michael@catalyst-partners.com - I focus primarily on WELL sampling, but the LEED sampling is relatively the same - and I still perform quite a few LEED IAQ sampling projects a year when it makes sense.