There are many technical options and fuels available which have the potential to reduce the environmental impacts of existing buses. This section of the InfoPool outlines these options by focusing on:

• Inspection and maintenance programs to identify buses needing repair.
  
• Replacement programs that replace or repower the existing bus engine with a new engine to meet lower emissions standards.
  
• Retrofit systems that upgrade existing conventional diesel buses with advanced technological equipment, in many cases in conjunction with low sulfur fuels.
  
• Bus conversions which refer to original diesel buses being converted to the use of alternative fuels, in most cases CNG or LPG.

You can access the sub-topics in this section by clicking on the above links or by clicking on the navigation links to the left hand side of the page.