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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount199.9870000 99.9799000 99.9091000 99.9982000 83.5400000 99.9920000 93.2000000 99.9984000 99.9915000 99.9725000 99.9600000 99.9994300 89.0000000 24.0000000 88.9972500Gas Comp 1NITROGEN DIOXIDE NITROGEN PPM HYDROGEN SULFIDE NITRIC OXIDE PPM CHLORINE