Environmental Defense Fund Fleet Emissions Calculator

The Environmental Defense Fund (EDF) needed to update their Fleet Emissions Calculator to reflect new national averages for emissions and account for the increase in popularity of alternative fuels. We updated the coefficients used in the formulas for calculating emissions for a variety of fuel types. We added coefficients for “upstream” emissions (e.g., emissions from a power plant for electric vehicles). We also updated their PHP code and performed bug fixes to improve the overall performance of the website.