Epidemiologic studies and control programs in alcoholism. II. State and municipal alcoholism programs and their relationship to health services

Deposition on indoor surfaces is an important removal mechanism for tobacco smoke particles.We report measurements of deposition rates of environmental tobacco smoke particles in a room-size chamber.The deposition rates were determined from the changes in measured concentrations by correcting for the effects of coagulation and ventilation.The air flow turbulent intensity parameter was determined independently by measuring the air velocities in the chamber.Particles with diameters smaller than 0.25 11m coagulate to form larger particles of sizes between 0.25-0.5 11m.The effect of coagulation on the particles larger than 0.5 11m was found to be negligible.Comparison between our measurements and calculations using Crump and Seinfeld's theory showed smaller measured deposition rates for particles from 0.1 to 0.3 11m in diameter and greater measured deposition rates for particles larger than 0.6 11m at three mixing intensities.Comparison of Nazaroff and Cass' model for natural convection flow showed good agreement with the measurements for particles larger than 0.1 11m in diameter, however, measured deposition rates exceeded model prediction by a factor of approximately four for particles in size range 0.05-0.1 11m diameter.These results were used to predict deposition of sidestream smoke particles on interior surfaces.Calculations predict that in 10 hours after smoking one cigarette, 22% of total sidestream particles by mass will deposit on interior surfaces at 0.03 air change per hour (ACH), 6% will deposit at 0.5 ACH, and 3% will deposit at 1 ACH

Aerosol · Deposition (geology) · Division (mathematics) · Engineering physics · Meteorology · National laboratory · Nuclear physics · Particle (ecology) · Particle deposition · Physics · Preprint · Quantum mechanics · Ventilation (architecture) · Air Quality and Health Impacts · Geology · Mathematics