About: http://webisa.webdatacommons.org/156856699

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	Personnel, including rescue workers, should not enter areas where the oxygen concentration is below 19%, unless provided with a self-contained breathing apparatus or airline respirator.
http://www.w3.org/ns/prov#wasQuotedFrom	federalregister.gov