7534
Previous studies have shown inexplicable declines in breeding waterbirds within western New York / New Jersey Harbor between 1996 and 2002 and elevated polychlorinated dibenzo - p - dioxins and polychlorinated biphenyls ( PCBs ) in double - crested cormorant ( Phalacrocorax auritus ) eggs .
 Chemical: polychlorinated dibenzo - p - dioxins; Chemical: polychlorinated biphenyls; Chemical: PCBs
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: polychlorinated dibenzo - p - dioxins; Chemical: polychlorinated biphenyls; Chemical: PCBs