-
Hydrogen
- H2
- 0.07
- Non poisonous, will not support life
- LEL 4%
- UEL 74%
- colour Less, Odourless, Tasteless
- After damp, spon-com, battery charging
- No legal limit
-
Methane
- CH4
- 0.55
- Non poisonous, slightly narcotic affect at high levels
- LEL 5%
- UEL 14%
- C/O/T
- Roof, Fire damp, After damp, Heatings
- Evacuate 2.5%
-
Carbon Monoxide
- CO
- 0.97
- Poision, displaces O2 in blood
- LEL 12.5%
- UEL 74%
- C/O/T
- Combustion, White damp, After damp
- LL 30ppm
-
Nitrogen
- N2
- 0.97
- Non poisonous
- Inert
- C/O/T
- Atmosphere, Most damps
- No legal limit
-
Oxygen
- O2
- 1.11
- Essential to life
- Non flammable, supports combustion
- C/O/T
- 19% Minimum
-
Hydrogen Sulphide
- H2S
- 1.19
- Poisonous, Fatal at 500 ppm, Instant death at 1000 ppm
- LEL 4.5%
- UEL 45%
- Colourless, Rotten egg odour, Sweet taste
- Stagnant water, Heating in coal containing Pyrites, Seam gas
- LTEL 10 ppm
- Max 15 ppm
-
Carbon Dioxide
- Co2
- 1.53
- Increases respiration 300% at 5%
- Toxic above 5%
- Possibly fatal above 15%
- Inert
- Colourless, Pungent smell, Soda taste
- Seam gas, Black damp, After damp, Choke damp, Combustion
- 1.25% TWA
-
Nitrogen Dioxide
- NO2
- 1.6
- Poisonous, 200 ppm possibly fatal
- Non flammable but supports combustion
- Reddish brown, Acrid smell, Acidic taste
- Shot firing, Diesels, After damp
- LTEL 3 ppm
- > 3 ppm TWA
- Max 5 ppm
-
Sulphur Dioxide
- SO2
- 2.26
- Poisonous, 500 ppm fatal
- Inert
- Colourless, Burning sulphur smell, Acidic taste
- Heatings, After damp
- LTEL 2 ppm
- > 2 ppm TWA
- Max 5 ppm
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