![]() ![]() Diagnosing Vegetation Injury Caused by Air Pollution. These climatological and topographical factors combine to provide plentiful sunshine which, in comparison to more northern latitudes, is enhanced in the ultraviolet (UV) radiation that drives atmospheric photochemistry to produce secondary pollutants such as ozone (0 3) and fine particles (Streit and Guzman 1996).ĪPTI 1976. ![]() During winter, inversions occur up to 25 days per month (DDF 1991). In addition, surface as well as upper air temperature inversions occur frequently, trapping pollutant emissions close to the surface. Because of this irregular topography and the relatively light winds, ventilation of the basin is poor. The average height of the surrounding mountain ranges is about 3200 m, with some peaks, including two volcanoes, exceeding 5000 m. ![]() The MCMA is located at the southern end of a semiclosed basin (19☂5′N, 99☁0′W), at a mean altitude of some 2200 m. MCMA air quality has been recognized as among the worst in the world (WHO 1997). On many sunny days, the residents of the Mexico City Metropolitan Area (MCMA) note that a thick gray haze builds up within this atmospheric basin impairing the visibility and the quality of the air. ![]()
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