About: http://webisa.webdatacommons.org/254813391

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	Can we, for example, measure levels of air pollutants today (with typically cleaner burning vehicles - but more of them) and compare these levels with those of 5, 10, 50 years ago?
http://www.w3.org/ns/prov#wasQuotedFrom	rwinters.com