a.)Direct exposures (24 hour) calculated from the maximum measured emissions in
Table 1 assuming 175 puffs per day (70 ml/puff).
b.) Indirect exposures (24 hour) calculated assuming 125 puffs (70 ml/puff) per 8-hour
work day in a 20.9 m2 office with a 2.4 m ceiling height and a 0.3 h-1 ventilation rate.
c.) California EPA (2011), No Significant Risk Levels (NSRL) for carcinogenic health
effects.
d.) California EPA (2012), Chronic Reference Exposure Levels (CREL) for noncarcinogenic
health effects, except 1% of the Cal/OSHA 8-hour PEL for propylene
glycol and nicotine, and the EPA NAAQS 3-month average for lead.
e.) Hazard quotients expressed as the ratio of the calculated exposure to the NSRL and
CREL health exposure guidelines, with values above 1.0 bolded.
f.) NNK, 4-(n-nitrosomethylamino)-1-(3-pyridyl)1-butanone.
a.)Direct exposures (24 hour) calculated from the maximum measured emissions inTable 1 assuming 175 puffs per day (70 ml/puff).b.) Indirect exposures (24 hour) calculated assuming 125 puffs (70 ml/puff) per 8-hourwork day in a 20.9 m2 office with a 2.4 m ceiling height and a 0.3 h-1 ventilation rate.c.) California EPA (2011), No Significant Risk Levels (NSRL) for carcinogenic healtheffects.d.) California EPA (2012), Chronic Reference Exposure Levels (CREL) for noncarcinogenichealth effects, except 1% of the Cal/OSHA 8-hour PEL for propyleneglycol and nicotine, and the EPA NAAQS 3-month average for lead.e.) Hazard quotients expressed as the ratio of the calculated exposure to the NSRL andCREL health exposure guidelines, with values above 1.0 bolded.f.) NNK, 4-(n-nitrosomethylamino)-1-(3-pyridyl)1-butanone.
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