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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount187.9890000 99.6710000 99.9620000 99.9370000 98.0000000 83.5400000 80.4375000 79.2000000 80.4890000 31.4000000 92.7820000 69.6000000 82.4100000 13.5000000Gas Comp 1NITROGEN DIOXIDE NITROGEN NITROGEN PPM CARBON DIOXIDE