<http://webisa.webdatacommons.org/prov/292907407> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/94807278> . <http://webisa.webdatacommons.org/94807278> <http://www.w3.org/ns/prov#wasQuotedFrom> <epa.gov> . <http://webisa.webdatacommons.org/94807278> <http://www.w3.org/ns/prov#value> "The commenter indicates that ozone is a natural chemical produced by natural processes in quantities much greater than any amounts produced by humans and ozone production is driven by natural, not anthropogenic, processes." . <http://webisa.webdatacommons.org/94807278> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> .