Environmental tobacco smoke (ETS)

Lit cigarette on a an ash tray

ETS is a mixture of exhaled mainstream tobacco smoke and smoke from a smouldering tobacco product (often referred to as "sidestream smoke").

This mixture is diluted in indoor air, and aged. The major contributor to ETS is the atmosphere itself which, in turn, is largely comprised of ambient (or outside) air. There is no environment in real life that is chemical and particle free and, in fact, the vast majority of smoke constituents that contribute to ETS are already present in ambient (or outside) air from other sources. We have published some research carried out in our laboratories on the measurement of environmental tobacco smoke and co-authored indoor air quality studies.