About: http://webisa.webdatacommons.org/372463932

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	For a long time, the complex mixture of different types of air pollution made it difficult to clearly separate the different sources of air pollution.
http://www.w3.org/ns/prov#wasQuotedFrom	eurekalert.org