Motor Vehicle Pollution Control in Mexico City

The geographical location of the Metropolitan Zone of Mexico City (latitude 19°35′N and 99°40′ west of longitud), its physiography (located in a basin at 2240 m of altitude) and its regional meteorology (high frequency of calms and temperature inversions through the year) combine with the emissions of stationary and mobile sources to conform a “virtual” natural reactor where the photochemical activity, represented by a high number of exceedences to the ozone Mexican air quality standar (0.11 ppm 1 hrs/day) is in the early 90's, the biggest problem in Mexico City. An analysis of the spatial distribution of the NOx and COV in the Metropolitan Area of Mexico City is made. Also, is included, an evaluation of the air quality control strategies implemented and its effects on the air quality of the Mexico Basin.