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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9250000 85.4900000 25.0000000 99.9999250 81.0000000 31.4100000 99.9550000 74.0000000 90.8110000 98.2000000 83.5400000 88.8240000Gas Comp 1NITROGEN NITRIC OXIDE PPM CARBON MONOXIDE AIR