09 ppm 180 gm 8 Hour 0070 ppm 137 gm 0075 ppm 147 gm 24 Hour 50 gm 150 gm Annual Arithmetic Mean 20 gm 24 Hour 35 gm Same as Primary Standard Annual Arithmetic Mean 12 gm Gravimetric or Beta Attenuation 120 gm 15 gm 1 Hour 20 ppm 23 mgm 35 ppm 40 m ID: 55663
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