Optical properties of atmospheric particles over an urban site in Mexico City and a peri-urban site in Queretaro. - Liñán-Abanto, Rafael N.; Peralta, O.; Salcedo, D.; Ruiz-Suárez, L. G.; Arnott, P.; Paredes-Miranda, G.; Alvarez-Ospina, H.; Castro, T. (Journal of Atmospheric Chemistry, 2019)