Many different gases can be detected and monitored:-
Flammable gases such as Methane & LPG
Carbon Dioxide
Refrigerant gases such as modern "Freons" and their replacements
Alcohols
"Greenhouse" gases
Combustion products such as Carbon Monoxide and Nitrogen Oxides
Oxygen
Ozone
Toxic gases such as Ammonia, Hydrogen sulphide and Carbon Monoxide
Ozone
