Breathlify Threshold for Under-ground Coal mine gases : Carbon Monoxide (CO): Specific Gravity: 0.967 TLV PPM: 60ppm Hydrogen Sulphide (H2S): Specific Gravity: 1.191 TLV PPM:10ppm Highly Toxic Gas Methane (CH4): Specific Gravity:0.5545 TLV PPM: 50,000-1,50,000 Concentration: (5-15)% Breathlify By Abhishek & Charmi Powered By Kickstart Solutions LLP