The third installment in our series of mass balance tutorials is on the three zone mass balance model. Using this tutorial, you can explore realistic 3-room residential layouts and potential exposures that may occur when a smoker is in an adjacent room.

I have started created tutorials that make use of the Flash animation player. To start, the first tutorial is on the mass balance model. This model is one of the the basic building blocks for simulating indoor exposure to SHS.

The creator of this website, Dr. Neil Klepeis, is available to perform custom simulations of tobacco smoke exposure for policy or education purposes -- in most cases free of charge. This service is intended to assist those website visitors who may want to explore a specific exposure situation or who may want to compare a variety of different potential exposures, such as those taking place in sophisticated multizone environments or involving prescribed human activity patterns.

I've added particle deposition to the simulations. The inclusion of particle loss due to deposition onto surfaces doesn't change the results very much, but it is a well known phenomena that acts to reduce airborne levels of SHS particles. Ventilation is usually a much stronger factor than deposition in removing SHS particles from a given location.

Important Change in Access: I've decided for the time being to disable the guestbook feature due to spam. Also, simulations will only be available to registered users to avoid overloading the servers. It is easy to register!