Visual #1

http://mapas.owje.com/maps/4957_a-hazy-day-in-mexico-city.html

http://alg.umbc.edu/usaq/images/no2trop20080124_r2.gif

http://www.nasa.gov/centers/goddard/images/content/143998main_intex2.jpg

this shows the path that the air pollution is taking

Visual #2

http://www.mexicocityexperience.com/i/slideshow_photos/air_quality_graphs/graph_airquality_1.png

http://oceanworld.tamu.edu/resources/environment-book/atmosphere.html

http://www.macalester.edu/courses/geog261/rmajor/Robin_Major_MexicoCity/GeographyandEnvironment.html

http://www.hispanicallyspeakingnews.com/notitas-de-noticias/details/mexico-city-restaurant-embarking-on-un-backed-emission-reduction-plan/