About: http://webisa.webdatacommons.org/381993908

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	(b) For Pb and PM 10 manual methods, at least one 24-hour sample must be collected every 6 days except during periods or seasons exempted by the Regional Administrator.
http://www.w3.org/ns/prov#wasQuotedFrom	govpulse.us