20130514 08474600 1.0 ISO 19139 Metadata Implementation Specification TRUE Air Monitoring Sites (03/18/13) and County Boundaries derived from BOA coordinates and Google Earth. ams boa iepa Air Monitoring Sites (03/18/13) and County Boundaries. Hyperlinks to DOQQ Maps, Ozone and PM2.5 reports. BOA, IEPA, ISGS Not to be used for commercial profit. 2013 Air Monitoring Sites 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