PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • been breathing in at least 18 toxic chemicals at levels sometimes as high as 540 times the health threshold established by the EPA.??? The 18 toxic chemicals detected by the air monitors, chemicals such as 1,3-butadiene and vinyl chloride, can cause cancer, cardiovascular disease and central nervous system damage.
http://www.w3.org/ns/prov#wasQuotedFrom
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