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Diskin, et al. conducted a study of the concentrations of the common breath metabolites ammonia, acetone, isoprene, ethanol and acetaldehyde in the breath of five subjects over a period of 30 days. “Breath samples were taken and analysed in the early morning on arrival at the laboratory.” http://hero.epa.gov/index.cfm?action=reference.details&reference_id=9895...
It is enlightening to compare their results for the three compounds that correspond to three of the six e-cigarette exhaled vapor compounds in the <em;Indoor Air </em;<em;study.</em;
<em;The Indoor Air study</em;<em; measured a concentration of 25 mcg/m3 of Acetone, which converts to 10.39 PPB. In Diskin’s study, Acetone ranged from 293-870 PPB. </em;
<em;The Indoor Air study found 10 mcg/m3 of Isoprene, which converts to 3.54 PPB. Compare to 55-171 PPB in Diskin’s study.</em;
<em;The Indoor Air study found 3 mcg/m3 of Acetaldehyde, which converts to 1.64 PPB, compared with 2-5 PPB in Diskin’s study.</em;
Therefore for these three compounds, bystanders would be in greater danger if exposed to exhaled breath of ordinary non-smoking, non-vaping citizens.
Three additional compounds were noted in the Indoor Air study. The quantities were reported as micrograms per cubic meter by the German researchers.&nbsp; OSHA Permissible Exposure Limit (PEL) are expressed as milligrams per cubic meter.&nbsp; To convert to mg/m3, divide the mcg value by 1000.
<em;2-Butanone (MEK) = 0.002 mg/m3&nbsp; (OSHA PEL = 590 mg/m3)</em;
<em;Acetic acid = 0.014 mg/m3&nbsp; (OSHA PEL = 25 mg/m3)</em;
<em;Formaldehyde&nbsp; = 0.016 mg/m3&nbsp; (OSHA PEL = 0.661 mg/m3)</em;
When all the scientific data are considered, we must conclude that bystanders are in no danger whatsoever from exhaled vapor, as the highest concentration measured represents a mere 2.4% of the OSHA PEL, and the remaining 5 compounds represent a fraction of 1% of the OSHA PEL.
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