<http://webisa.webdatacommons.org/2285694>	<http://www.w3.org/ns/prov#value>	"Common sources include unpaved roads, waste burning, agriculture, and other activities along the U.S.-Mexico border." .
<http://webisa.webdatacommons.org/prov/463365611>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2285694> .
<http://webisa.webdatacommons.org/2285694>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<epa.gov> .
<http://webisa.webdatacommons.org/prov/459731997>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2285694> .
<http://webisa.webdatacommons.org/prov/47022679>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/2285694> .
<http://webisa.webdatacommons.org/2285694>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .