Indoor Exposure

Belmont, CA Bans Smoking in Apartments

In the News Residential Exposure

The city of Belmont, California has passed a law banning smoking inside multi-unit housing. Soon, we at SimSmoke.Org will offer tools to explore exposures caused by leakage or drift of secondhand smoke between apartment or condominium units.

New Three-Zone Flash Tutorial

Announcements

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.

Three-Zone Mass Balance Model

Tutorials

This tutorial is the third in a series that explores the mass balance model. Here, you can explore a three-zone model. Before using this tutorial, you should read the two previous tutorials containing an introduction to the mass balance model and an exploration of a two-zone model.

A New Two-Zone Flash-Based Tutorial

Announcements

I just added a new Flash-based tutorial on the two-zone mass balance model. This tutorial allows you to interactively explore the effect of different parameters on the transport of pollution generated in one room to an adjacent room. In the future, I will be adding more Flash-based tutorials, and I will create Flash simulations of secondhand smoke exposure aimed at different audiences.

Exploring a Two-Zone Mass Balance Model

Tutorials

After you have read about and understood the single-box model as presented in the introduction to the mass balance model tutorial, you are ready to explore more complex arrangements of zones. In the real world, homes typically consist of more than just a single room.

This exercise allows you to interactively explore a two-zone box model for air pollutant emissions. The pollutant mass is emitted into the first zone (Room #1), but it can travel to the second zone at the flow rate that you specify. Pollutant mass is removed from both zones by ventilation or by deposition onto surfaces. The emissions are assumed to be instantly mixed throughout the zones.

New Flash-Based Tutorials

Announcements

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.

Introduction to the Mass Balance Model

Tutorials

On this website, we use a simple mass balance model to simulate indoor levels of SHS. The essence of the mass balance model is that the rate of change in pollutant mass in a given space at any given instant is equal to the amount coming in, minus the amount leaving. In an equation:

CHANGE_IN_POLLUTION = POLLUTION_ENTERING - POLLUTION_LEAVING

For this tutorial you can use a Flash animation to explore a single-zone box model, one of the most simple applications of the fundamental mass balance equation. Although the model can be applied to either air pollution or water pollution, we are interested in emissions of pollution from cigarettes and other tobacco sources.

Box Model

The pollutant mass is assumed to be emitted into a confined space, in which the emissions are instantly mixed throughout the space. The air containing the mixture of pollutants can be exchanged with the outside. The pollution in the air can also be removed from the space by active filtration and by deposition onto surfaces present in the space.

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