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Chlorine is included in the Wikipedia CD Selection, see Chlorine at Schools Wikipedia. Please maintain high quality standards; if you are an established editor your last version in the article history may be used so please don't leave the article with unresolved issues, and make an extra effort to include free images, because non-free images cannot be used on the DVDs.
The reputable site www.epa.gov/ttn/atw/hlthef/chlorine.html has it that
"Chlorine has a suffocating odor; the odor threshold is 0.31 ppm"(7)
reference: (7) J.E. Amoore and E. Hautala. Odor as an aid to chemical safety: Odor thresholds compared with threshold limit values and volatilities for 214 industrial chemicals in air and water dilution. Journal of Applied Toxicology, 3(6):272-290. 1983.
Yet this page, perhaps a mistake with the decimal point, says it smell onyl at > 3ppm, out by x10. — Preceding unsigned comment added by 220.127.116.11 (talk) 09:48, 8 December 2013 (UTC)