Study area and location of sampling sites A location of Nuevo Leon in Mexico B location of MMZ inside of Nuevo Leon C location of the sampling sites according to the level of atmospheric pollutant D location of the sampling sites according to the levels of vegetation cover.

 
 
  Part of: Meléndez-Jaramillo E, Cantú-Ayala CM, Treviño-Garza EJ, Sánchez-Reyes UJ, Herrera-Fernández B (2021) Composition and diversity of butterflies (Lepidoptera, Papilionoidea) along an atmospheric pollution gradient in the Monterrey Metropolitan Area, Mexico. ZooKeys 1037: 73-103. https://doi.org/10.3897/zookeys.1037.66001