Particle air filtration in HVAC supply-air streams: performance and cost implications of various methods of reducing indoor concentrations of particles.(Cover Story)

Increased concentrations of particles in outdoor air are associated with increases in hospital admissions, deaths, and other health effects; (1) however, most people's exposures to these outdoor particles occur predominately indoors, where approximately 90 percent of their time is spent. Several classes of health effects linked to particle exposures may be reduced via filtration. These include:

* Allergy and asthma symptoms, which may be produced in susceptible individuals upon inhalation of allergenic particles such as pet allergens, dust-mite allergens, and pollen from outdoor ...

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