Acid rain is a common environmental problem in and near large cities and sizable combustion sources. Various actions have been implemented in Mexico City in order to abate NOx and SOx emissions from point, area, residential and mobile sources. As an indicator of air quality, a sampling campaign of Acid Deposition Program was conducted during 1997. The data show acidity levels in large areas of Mexico City Metropolitan Area (MCMA) as a consequence of emissions that also contribute to air quality problems. This paper attempts to relate the effectiveness of several measures of emission control, such as the reduction of the sulphur content of fuels, introduction of the catalytic converter, a day without a car, etc. and linking it with the acid rain phenomena. The acidity levels in 1997 were higher than obtained in 1996. We studied the relationship between these values considering the sampling techniques used on sampling campaigns of 1996 (1996 bulk deposition) and 1997 (wet and dry deposition). Is necessary a considerable effort to reduce the emissions that contribute to acid rain formation and as ameliorate its impact on important ecological conservation zones located in south of Mexico City. Therefore the government staff has to reinforce its control strategies to avoid not only the exposure of population to these acid rain precursors and but also protect the natural environment.
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