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The National Ambient Air Quality Standards (NAAQS) are maximum allowable levels for _____ harmful pollutants. a, sixteen b.sixty c.six d.ten
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The National Ambient Air Quality Standards (NAAQS) are maximum allowable levels for _____ harmful pollutants.

a, sixteen
b.sixty
c.six 
d.ten

User Xinting WANG
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C. Six hope this is the correct answer
User Reiswindy
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