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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9986500 83.5400000 99.9200000 99.9825000 79.7450000 99.9020000 99.9750000 81.9973000 93.2000000 95.4964000 82.4100000 80.4890000 99.9899000Gas Comp 1NITROGEN NITROGEN DIOXIDE PPM CARBON DIOXIDE NITROGEN