%0 Conference Proceedings
%K Indoor environment department
%K Airflow and pollutant transport group
%K Countermeasures to chemical and biological threats
%K Air leakage
%K Shelter-in-place
%K Air infiltration
%K Air-exchange rate
%K Outdoor toxic release
%A Wanyu R Chan
%A Phillip N Price
%A William W Nazaroff
%A Ashok J Gadgil
%B Proceedings of The 10th International Conference on Indoor Air Quality and Climate - Indoor Air 2005
%C Beijing, China
%D 2005
%G eng
%I Tsinghua University Press
%P 1729-1733
%T Distribution Of Residential Air Leakage: Implications For Health Consequences Of An Outdoor Toxic Release
%V 2(6)
%1 <p>4</p>
%X <p>Reasonably airtight buildings can protect occupants from large-scale outdoor airborne releases. However, some houses are leaky, as air tightness tends to vary greatly in a housing stock. We modeled the health consequences if a single-family residential community were to "shelter-in-place," for two different models of a toxic release: (I) a simple Gaussian puff, and (II) a realistic simulation of outdoor transport and dispersion generated by the National Atmospheric Release Advisory Center. We predicted the health effects under two different assumptions: (1) every house has the same indoor-outdoor air-exchange rate, or (2) the houses have a lognormal distribution of air-exchange rates.  The assumption that every house has the same air-exchange rate (at the median of the actual distribution) can lead to an under-prediction of the community area adversely affected by the release by a factor of 3 or more. The difference is largest if the dose-response relationship of the chemical is highly nonlinear.</p>