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4.5 Standards and guidelines for air quality In this study, eleven constituents (NNN, NAT, NNK, acetaldehyde, propionaldehyde, n -butyraldehyde, benzene, pyridine, TVOC, PG, and G) showed a substantial increase in indoor air concentration when heating tobacco systems were used in the Restaurant and Residential simulated environments (Tables 2, 3, Supplementary Tables S9S16)

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Elle se compose de plusieurs lments : eau, parfois, mais rarement de l alcool (en faible quantit) et propylne glycol (PG) ainsi que de la glycrine vgtale (VG)