Percentage limit of gases in ug mines
Gases. Min. Limit. Max. Limit
O2{oxygen}. 19%. ------
Co2{carbon dioxide}. ----------. 0.5%
CH4 /methane. ----------. 1.25%at anyplace in mines
. 0.75 in return
CO/carbon monooxide. ---------. 0.005%/50ppm
NOx/nitrous fumes. ---------. 0.0005%/5ppm
H2S/hydrogen sulphide. ......... 0.0010%/10ppm
SO2/sulphur dioxide .......... 5 ppm/0.0005%
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