As part of the Enhancing North American Air Quality Management project, the Commission for Environmental Cooperation (CEC) endeavored to obtain information on vehicle activity in six typical cities in Mexico. In order to update the national inventory on mobile source emissions in Mexico, the information could be extrapolated to other cities of similar size (in terms of population and vehicle fleet composition), socioeconomic characteristics, and physiographical conditions, all aspects that influence the emission of air pollution by motor vehicles. 

• Executive Summary - Measurement and Adaptation of Vehicle Activity Variables in Mexican Sample Cities
• Final Report - Measurement and Adaptation of Vehicle Activity Variables in Mexican Sample Cities (available in Spanish only)
• Vehicle Activity Database
• Vehicle Activity Database (Access 2007)
• Vehicle Activity Database - reference guide