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PM25 <13ug/m3 PM25 12-14ug/m3 PM25 14-16ug/m3 PM25 16-18ug/m3 PM25 18-20ug/m3 PM25 20-22ug/m3 PM25 >22ug/m3
<12 12 14 16 18 20 >22
Passes annual mean objective Fails annual mean objective