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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9010000 99.9972000 99.9856000 81.9910000 90.4000000 99.9787500 99.9922000 81.6580000 83.5400000 99.8110000 99.9550000 94.5000000 99.9970000Gas Comp 1NITROGEN NITROGEN NITROGEN DIOXIDE PPM CARBON DIOXIDE