PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • We know that the primary air contaminants generated by shale gas development are nitrous oxides (NOx), volatile organic compounds (VOCs), very fine particulate matter (PM2.5), methane (CH4), and air toxics such as benzene, toluene and formaldehyde.
http://www.w3.org/ns/prov#wasQuotedFrom
  • pennfuture.org