title: [What is the use of the metropolitan index of air quality?].
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D008800:Mexico
chemical_list: D000393:Air Pollutants
vernacular_title: Para qué sirve el índice metropolitano de la calidad del aire (IMECA)?