About: http://webisa.webdatacommons.org/15334805

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	They found carbon monoxide and 1,3-butadience, both of which are produced by vehicle exhausts and particularly diesel engines, were the major cause of the increased risk.
http://www.w3.org/ns/prov#wasQuotedFrom	colorado.edu