PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Particulate and gaseous air contaminants (sulfur dioxide, ozone, nitrogen dioxide, and chlorides) are ubiquitous, especially in urban areas where industry and transportation are heaviest.
http://www.w3.org/ns/prov#wasQuotedFrom
  • abc-clio.com