About: http://webisa.webdatacommons.org/219263480

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	Chemicals such as chlorine, sulfur dioxide, ammonia, nitric acid, hydrochloric acid, and hydrofluoric acid are included.
http://www.w3.org/ns/prov#wasQuotedFrom	psmtechnicalservices.com