5248
Oil mist risks When the concentration of Oil Mist increases and reaches the lowest explosion level ( LEL ; 50mg / ℓ , as defined by the IACS ) , it can explode when it comes in contact with surfaces of over 200 ℃ or spark by static electricity .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None