Information from the Mandatory Inspection andMaintenance(I/M)Program carried out in October 1996 and the firstsemester of 1998 provides a useful emission database for Mexico City.Carbon monoxide (CO)and hyrocarbon(HC)exhaust emission levels weremeasured for at least a million private and public transportationvehicles. Analysis of this database leads us to conclude that thisinformation can be used to test anti-pollutant policies, and isuseful as a performance quality index for vehicle manufacturers. Someof the results of this analysis include: the finding of a typicalexhaust emission distribution curve for each vehicle manufacturer,with differences for each brand and model for the same manufacturer,the fact that not all new vehicles pass the I/M test; and publictransportation vehicles in Mexico City have almost useless catalyticconverters.
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