5504
The fine ( PM1 ) , and quasi - ultrafine ( PM0 . 4 ) Milan particles collected during different seasons have been characterised and the biological effects on human epithelial lung A549 , monocytes THP - 1 cells and their co - culture , evaluated and compared with the results obtained on the PM10 and PM2 . 5 fractions .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None