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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9989000 99.9760000 99.8200000 99.9992000 99.4000000 81.9820000 99.9810000 55.0000000 95.4725000 83.5400000 81.2000000 82.4100000Gas Comp 1NITRIC OXIDE NITROGEN NITROGEN DIOXIDE PPM HYDROGEN SULFIDE PPM CHLORINE