About: http://webisa.webdatacommons.org/7168367

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	Air toxics, such as mercury, that are present in the vapor phase are typically fob in very low concentrations, for example, parts per million or less, making removal difficult.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr