A wind tunnel dispersion modeling study was conducted to investigate exhaust contamination of hidden versus visible air intakes. A hidden intake is typically on a building sidewall or on the sidewall of a roof obstruction opposite the exhaust source. A visible intake is at roof level or on top of
an obstruction, directly above the hidden intake. Overall, the study has shown what designers suspected: placing air intakes on building sidewalls is beneficial when the stacks are on the

This paper summarizes efforts to identify economically viable strategies to reduce HVAC-related energy use while improving the indoor air quality for a public zoo facility that houses primates and large cats. The primary focus of energy conservation strategies for the facility centered on use of airto-air energy recovery devices. Computer simulations, validated with experimental data from the facility, were used to estimate energy savings for alternative energy conservation strategies.

Particle diffusion with gravitational sedimentation in displacement and mixing ventilated rooms is investigated numerically. The drift flux model, which considers the settling of particles under the effect of gravitational sedimentation, is adopted to simulate particle diffusion, while the simplified
model for solving the continuous fluid flow is combined. Since the PM 2.5 and PM 10 particles are mostly concerned in indoor environment, passive contaminant and 2.5-20 micron particles are investigated in this paper. The numerical results show that in a mixing ventilated room, the

One challenge in indoor air quality studies is the measurement of three-dimensional air velocity profiles in an airspace so that the nature of airflow can be better understood and appropriate ventilation systems can be designed. There is much dispute over a variety of computational fluid dynamics (CFD) models, primarily due to a lack of credible data to validate those models. This study aimed to develop a stereoscopic particle imaging velocimetry (SPIV) system suitable for easurement of full-scale room three-dimensional airflow.

Pollutants found in indoor air are often several times higher than outdoors. Indoor air pollutants cause effects ranging from odor, annoyance, and irritation to illness, cancer, and even death. Since people spend the majority of their time indoors, it is important to recognize and control indoor air pollution. Some indoor air pollutants also adversely affect materials in the building and the building structure itself. The majority of indoor pollution comes from the building itself, its contents, or its occupants and their activities.

This paper is a commentary on comments made by Drs Molhave and Wolkoff regarding indoor air pollution indices presented by the authors in 2003. They make it clear that IAPI attains the following aims : it is easily understood by all stakeholders, it associates well with symptoms, and provides a setting for management of the indoor environment.
Bu this index is a metric of in-office pollution and not a metric of a specific pollutant.

The authors agree with the arguments by Mendell for seeking a composite index relating indoor environmental quality (IEQ) and building related symptoms (BRS). The determination of the (IPSI) Indoor Pollutant Standard Index is a useful first-step for the practitioners. It provides scope for further refinement that could incorporate the relative impact of more than just one measured indoor pollutant.

Indoor air is complex with its pollutants constantly changing (in time, spatial distribution and proportions). Furthermore distinction between organic compounds and particles becomes ambiguous.So developing a valid Indoor Air Pollution Indice becomes difficult : a symptom has usually different causes, and a given pollutant brings different effects alone or in combinaison with other kinds of exposure.

The variables that can be quantified in biological systems are called biomarkers. In a broadest sense biomarkers are substitute measures used because the variable of interest cannot be measured for practical, economical or principal reasons.The quality of a substitute measure refers to the quality of the predictions which can be made based on it. Those predictions must have a very low frequency of mistakes.The indices cannot be used alone unless better documentation of the quality of their predictions is established.

The best protection of human health from adverse environmental exposures is possible when both the disease and its specific causal exposures are understood.Building-related symptoms (BRS) have caused an increasing public and scientific concern about Indoor Environmental Quality (IEQ), for over 20 years.