Abstract
Background: Air pollution is a known risk factor for adverse health effects. Many epidemiological studies use outdoor air pollution levels based on fixed-site monitoring data as a surrogate for human exposure, however individuals spend, on average, 85% of their time indoors, where exposure sources differ from outdoors. Personal monitoring allows more appropriate exposure estimation, but, to date, little has been done to compare exposure based on fixed-site versus personal monitoring, and no such comparisons have been carried out in the Middle East. Aims: To investigate the validity of fixed-site versus personal monitoring of PM2.5 in an industrial city in Saudi Arabia. Methods: We collected 24-hour personal monitoring of PM2.5 exposure from 28 students aged 16-18 years, using a SidePak AM510 set to record PM2.5 levels every minute. Students completed a time-activity diary to identify time spent in key microenvironments, especially outdoors and indoors. Students also carried a GPS device to log their geogr...
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