<http://webisa.webdatacommons.org/prov/82178415>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/311357662> .
<http://webisa.webdatacommons.org/311357662>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<epa.gov> .
<http://webisa.webdatacommons.org/311357662>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/311357662>	<http://www.w3.org/ns/prov#value>	"Ozone concentrations indoors typically vary between 20% and 80% of outdoor levels depending upon whether windows are open or closed, air conditioning is used, or other factors such as indoor sources." .