1. Aldape F, Flores J, Flores YJA, Retama-Hernández A, Rivera-Hernández O (2005) Elemental composition and source identification of PM2 5 particles collected in downtown Mexico City. Int J PIXE 15(3):263–270. https://doi.org/10.1142/S012908350500060X
2. ATSDR, Agency for Toxic Substances and Disease Registry (2012a) Toxicological profile for Chromium [ATSDR Tox Profile]. Department of Health and Human Service, Public Health Service, Atlanta, GA:U.S.
3. ATSDR, Agency for Toxic Substances and Disease Registry (2012b) Toxicological profile for manganese. U.S. Department of Health and Human Services, Atlanta, GA
4. ATSDR, Agency for Toxic Substances and Disease Registry (2019) Toxicological profile for antimony and compounds. Department of Health and Human Service, Public Health Service, Atlanta, GA:U.S.
5. Bravo-Álvarez H, Sosa-Echeverria R, Sánchez-Álvarez P, Krupa S (2013) Air Quality Standards for Particulate Matter (PM) at high altitude cities. Environ Pollut. https://doi.org/10.1016/j.envpol.2012.09.025