CONSTRUCTION FUMES ENTER NURSES’AREA THROUGH EXPANSION JOINTS P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #3 Background When a hospital began renovating its first floor, the second-floor staff located directly above the construction area immediately complained of odors and other discomforts, including headaches. When building management investigated the complaints, they could not detect any odors and could not understand why only this small group of second-floor workers was experiencing these symptoms. When the nurses’ complaints persisted, building management inspected the first-floor work area to determine whether construction practices were actually the source of the problem. An inspection of the air-handling system serving the construction are

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