| http://www.w3.org/ns/prov#value | - The selection of urban study areas was based on a number of criteria including: (1) Consideration of urban study areas evaluated in the last PM risk assessment; (2) consideration of locations evaluated in key epidemiological studies; (3) preference for locations with relatively elevated annual and/or 24-hour PM 2.5 monitored concentrations; and (4) preference for including locations from different
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