22417
The methods proposed were applied to the determination of the target PAHs in fish samples from different countries , and it was found that the low PAH contamination of the selected fish oils could mainly occur by atmospheric sources .
 Chemical: PAHs; 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: PAHs; Chemical: PAH