About: http://webisa.webdatacommons.org/233457352

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	here is their reasoning: Earlier studies have shown that in many cities, including Boston, Chicago and Washington, D.C., there is more lead in the air in the summer ??? because of wind, humidity and other factors.
http://www.w3.org/ns/prov#wasQuotedFrom	apr.org