REFERENCES
- Mexican Environmental Standard on Vehicular Emissions (Norma Ecolôgica NOM-041-ECOL-1996); Institute Nacional de Ecologia.
- Statistics from the Departamento del Distrito Federal; accessed at http:// www.ddf.gob.mx/sedeco/transporte/vehic.htm, 1998.
- Normatividad Ambiental y Emisiones Vehiculares en Mexico (Environmental Standards and Vehicular Emissions in Mexico); Report from the CESPEDES Group (Centro de Estudios del Secto Privado para el Desarrollo Sustentable), ch. 2; September 1998.
- Programma para mejorar la calidad del aire de la zona metropolitana del valle de Mexico 1995-2000 (Program to Improve Air Quality in the Metropolitan Area of the Valley of Mexico 1995-2000); Institute Nacional de Ecologia (INE): Mexico City, 1995; also see the INE home page at http://www.ine.gob.mx/programas/prog_mcam/contenido.