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- By CategoryMixed GasesGas Comp 4PPM CARBON MONOXIDEGas Comp Amount188.7500000 99.9600000 90.9895000 99.9830000 95.9910000 81.0000000 95.5000000 99.9993000 94.0000000 99.9749500 99.9998000 25.0000000 50.0000000 85.0000000 93.8450000 99.9925000Gas Comp 1PPM FORMALDEHYDE CHLORINE HYDROGEN PPM HYDROGEN SULFIDE NITROGEN PPM NITROGEN