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Overall , the biomarker results were consistent with the sediment PAH results , showing a pattern of low levels of PAH bile metabolites and DNA damage at the upstream ( reference or background location ) , as well as the remediated section , high levels at the two immediate downstream sites , and somewhat lower levels at the furthest downstream site .
 Chemical: PAH; Chemical: PAH
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PAH; Chemical: PAH