In this research, the background of the studies carried out in Mexico on the subject of atmospheric deposition was integrated. 195 publications were reviewed, including articles, reports, technical reports and theses. The first studies on acid rain in Mexico City began in the 80's between the National Meteorological Service and the National University of Mexico (UNAM). The case of Mexico City is an example of collaboration between the government and the academic sectors, with joint evaluation of atmospheric deposition since 2002.

It was found that the acidity of rainwater increased from North to South in Mexico City, taking into account the spatial variability of the pH and the influence of meteorology. Therefore, to solve this problem, other aspects should be considered, such as the dispersion, transport, deposition and concentration of acid rain precursors, as well as the reaction mechanisms.

The results of the investigations carried out in Mexico on wet atmospheric deposition have shown the presence of the acid rain phenomenon at the different studied sites, with the exception of Monterrey, Nuevo León and Calakmul, Campeche, where higher weighted pH values to 5.6 were recorded. The potential problem of deterioration in sites of natural and cultural interest continues, due to acid pH on the coast of the Gulf of Mexico and in the Southeast of the country.

An indicator of the reduction of emissions of acid rain precursors is the SO₄^2- / NO₃^- ratio, which it was applied during the realization of this study. Comparing the chemical composition of rainwater in the Gulf of Mexico region with stations located in the United States from Texas to Florida is instructive. The State of Veracruz site reported the high values of the SO₄^2- / NO₃^- ratio (a value of 4.9 was registered for 2015), which demonstrates the high contribution of sulfur compounds in the atmospheric deposition and the need to control the emissions of the main sources of SO₂ in Mexico.

There is a SO₄^2- / NO₃^- ratio of 1.5 at Mexico City, at almost all the stations. However, it is interesting to mention that at the beginning of the 80's s this ratio was four, coinciding with the value currently registered actually in the Gulf of Mexico region.

It is necessary to create links with different institutions for jointly and permanently to promote the operation of a National Atmospheric Deposition Network in Mexico, as well as to strengthen collaboration at an international level. In the last years, collaboration between UNAM and NADP has started and is growing.