WIDESPREAD IAQ COMPLAINTS TRACED TO BOILER STACK EXHAUST P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #6 Background Occupants throughout an eight-floor office building were routinely complaining to building management about poor indoor air quality (IAQ). Their symptoms included headaches, eye irritation, sore throat and fatigue. These widespread and persistent complaints were primarily general in nature and could not be correlated to particular locations, time of day or specific events. Management was also aware of anecdotal claims of more serious illnesses. Although never specifically related to air quality, these claims heightened occupant concern. Building management made many attempts to address the complaints. The most comprehensive efforts related

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