INVESTIGATION REVEALS FAULTY EXHAUST FAN P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #2 Background Workers in the poison control center of a hospital emergency department were experiencing symptoms possibly related to poor indoor air quality (IAQ) and shared their concerns with building management. These symptoms included headaches, eye irritation, sore throats, chest pains, and fatigue. Of the entire emergency department, only the poison control staff experienced these symptoms even though a single air-handling unit supplied the department. The complaints could not be correlated to time of day or specific events; however, all of the complaints had occurred within the previous three months and were growing in severity and frequency. Building manage

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