Biogas contains mainly which gases?

1. Methane and Butane
2. Methane and Carbondioxide
3. Methane and Chlorofluorocarbon
4. Methane and Argon

Biogas is mainly made up of methane (CH₄) and carbon dioxide (CO₂).  

Typically, biogas contains:

• Methane (CH₄): 50-75%  
• Carbon Dioxide (CO₂): 25-50%  

It can also contain smaller amounts of other gases such as:

• Hydrogen sulfide (H₂S)
• Nitrogen (N₂)  
• Hydrogen (H₂)
• Ammonia (NH₃)  
• Water vapor (H₂O)  

However, methane and carbon dioxide are the primary components that make up the bulk of biogas. The methane content is what makes biogas a valuable fuel source, as it is a combustible gas.Sources and related content