RESPIRATORY COMPLAINTS CLOUDED BY SMOKE THEN TRACED TO VACANT SPACE P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #9 Background Suffering from eye irritation and breathing difficulty, retail workers at a clothing store had complained for over a month. Shopping mall management could not identify any reason for the symptoms. This concern was rapidly transformed to urgency when one of the workers suddenly experienced severe respiratory symptoms, including a nosebleed, and coworkers rushed her to the hospital for treatment. The property manager was unable to explain the cause, and the storeowner insisted on an air quality investigation. Problem Assessment The property manager, familiar with IAQ investigations, authorized a special survey employing a P-TrakT

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