RESPIRATORY COMPLAINTS LINKED TO IMPROPERLY STORED CHEMICALS P-TRAKTM ULTRAFINE PARTICLE COUNTER CASE STUDY #5 Background A junior high chemistry student could not participate in laboratory sessions because the laboratory environment aggravated his asthma. He experienced difficulty breathing shortly after entering the laboratory, even when chemicals were not in use. The student did not have these symptoms at any other locations in the school. The student’s parents wanted their child to attend this laboratory class and asked the school board to determine the cause of his complaints. Problem Assessment The school board, familiar with ultrafine particles (UFPs) and their application in tracking pollutant sources, authorized an investigation employing

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