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Multiple indoor sources emit PGEs.
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However, multiple demand scenarios including variable locations of occupants and indoor sources may exist in daily operation of the ventilation system.
For example, in a study recently published in the American Journal of Public Health, Gary Adamkiewicz and colleagues used a simulation model to demonstrate that in homes with low air exchange rates and multiple sources of air pollution, up to 90% of exposure to fine particulate matter came from indoor sources.
Indoor pollutant concentrations are influenced by indoor sources and sinks and penetration from the outdoor environment.
In the absence of indoor sources such as gas appliances, NO2 indoor/outdoor relationships are strong.
Indoor−outdoor differences were significantly greater than 0 and indoor and outdoor levels were not correlated, indicating primarily indoor sources.
This suggests that indoor sources influenced the indoor levels of n-alkanes and n-alkanoic acids.
There is no corresponding established methodology for HIA of indoor air pollution from indoor sources.
Indoor concentrations of HAPs, however, can originate from outdoor as well as indoor sources.
Further, indoor concentrations were apportioned to determine the fraction from outdoor and indoor sources.
No correlation between indoor and outdoor levels was observed, suggesting dominant indoor sources.
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