PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Elements of a Proactive IAQ Monitoring ProgramYou should conduct IAQ monitoring at 6- to 12-month intervals, measuring carbon dioxide, carbon monoxide, respirable dust, formaldehyde, VOCs and other gases, mold spores, pressure differentials, and Legionella in water.
http://www.w3.org/ns/prov#wasQuotedFrom
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