Mixed Ecological StudyMexico City (CDMX) during the last decades has been afflicted by high concentrations of environmental pollutants that affect air quality, being ozone the main problem due to the impact it has on the health of the population. It is known that green areas have a benefit on the quality of life and that they can counteract environmental pollution, however, there are very few investigations that interrelate three very important environmental factors; ozone concentrations, green areas and geographic characteristics of the study area. Therefore, this project aims to investigate the relationship between ozone concentrations, green areas in specific areas of the CDMX with respect to consultations of children under five years of age for respiratory diseases, in order to generate a proposal to conserve and increase urban green areas of the city, thus obtaining environmental benefits and above all, health benefits for the population involved.