A.2010-08-19 B.2010-10-01 C.2011-01-01 D.2011-06-01
A.2000-09-30 B.2000-10-01 C.2001-01-01 D.2001-09-01
A.≤0.08mg/m3B.≤0.09mg/m3C.≤0.10mg/m3D.≥1.0mg/m3