Download the VAPIS 1.01 tool, brochure, operational manual, and the working paper on four ways to build vehicular emissions inventory (see SIM 02-2008).

VAPIS is an user friendly spreadsheet based tool, designed to quickly analyze emission trends for a single vehicular category for a single pollutant. This tool allows the user to start with the basic information on vehicular numbers, growth rates, age splits, kilometers traveled per day, average retirement age, and emission factors, and establish the vehicular number and emission trends for a period of 30 years, by age group.

The basic equation utilized for these calculations and a snapshot of the inputs page, data from which is propagated through the equation, are displayed below.

A combination of graphs generated by the VAPIS tool are presented here. Being an spreadsheet based tool, the user will be able to plug and play with the parameters for intermediate years and note the changes immediately.

The VAPIS tool also provides a step to conduct scenario analysis and compare the results (right-bottom-panel in the above table) where examples like reduced VKTs, new retirement policies, new emission standards, can be analyzed and visualized immediately.

For the user's benefit, a fleet average emission factors are generated (which should be used with discretion) and presented below.

Not all the cities are equipped with emission testing facilities, which cost millions for establishment, operation, and maintenance. Existing emission databases include:

1. United States Environmental Protection Agency’s AP-42 Handbook
   
2. MOVES (Motor Vehicle Emission Simulator)
   
3. Emission Factor Database by National Atmospheric Emissions Inventory of UK
   
4. Air Pollutant Inventory Program of SEI
   
5. Emission Factor Database by Central Pollution Control Board of India
   
6. Emission Factor Database by DIESEL Program of PCD Thailand & the World Bank
   
7. Emissions Analysis Tool by ICLEI
   
8. COPERT by European Environmental Agency
   
9. IPCC Guidelines for GHG
   
10. GAINS of IIASA
    
11. TREMOVE for European Countries
    
12. EMEP Corinair Emissions Inventory Guidebook
    
13. Transport Emissions Analysis for Hanoi by WRI/EMBARQ
    

*** The tools and documents are free to download. However, please cite appropriately. Feedback and suggestions are welcome.