Air pollution in cities |
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| Institution: | 1. Environmental Health Sciences, School of Public Health, University of California at Berkeley, Berkeley 94720-7360, USA;2. Energy and Resources Group, University of California at Berkeley, Berkeley 94720-3050, USA;3. Centre for Environmental Policy, Imperial College London, UK;4. Environmental Health Department, National Institute of Public Health, Cuernavaca, Morelos, Mexico;5. Environmental Health Sciences Department, Fielding School of Public Health, University of California, Los Angeles, 90095-1772, USA |
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| Abstract: | Air quality in cities is the result of a complex interaction between natural and anthropogenic environmental conditions. Air pollution in cities is a serious environmental problem – especially in the developing countries. The air pollution path of the urban atmosphere consists of emission and transmission of air pollutants resulting in the ambient air pollution. Each part of the path is influenced by different factors. Emissions from motor traffic are a very important source group throughout the world. During transmission, air pollutants are dispersed, diluted and subjected to photochemical reactions. Ambient air pollution shows temporal and spatial variability. As an example of the temporal variability of urban air pollutants caused by motor traffic, typical average annual, weekly and diurnal cycles of NO, NO2, O3 and Ox are presented for an official urban air-quality station in Stuttgart, southern Germany. They are supplemented by weekly and diurnal cycles of selected percentile values of NO, NO2, and O3. Time series of these air pollutants give information on their trends. Results are discussed with regard to air pollution conditions in other cities. Possibilities for the assessment of air pollution in cities are shown. In addition, a qualitative overview of the air quality of the world's megacities is given. |
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