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Abstract
The purpose of this study was to evaluate the suspended particulate matter levels indoors and outdoors in the Engineering Laboratories in the College of Engineering at King Saud University in Riyadh. The total suspended particulate matter (TSP) was evaluated by using standard high volume air samplers and the inhalable particulates (IP) were evaluated by using circular Jet cascade impactors, (IACFM Andersen Samplers). The average TSP for samples taken outdoors was 662 μg/m3 while the average TSP indoors was 167 μg/m3. The average indoor-outdoor ratio for TSP was 0.25. The average IP less than 10/um in size for samples taken outdoors was 137 μg/m3 while the average IP indoors less than 10 μm was 78 μg/m2. The average indoor-outdoor ratio for IP was 0.59. The average geometric mean size of the IP outdoors was 1.54 μm while indoors the average geometric mean size was 1.33 μm. It would appear that to set air quality standards it would be appropriate to consider both indoor and outdoor exposures.