Question

what is urban pollution??????

Answer 1

Answer:

Although there is not a universally accepted definition, the concept of urban pollution refers to the presence or introduction in cities and urban areas of poisonous or harmful substances. Urban pollution may come from natural sources, but the most detrimental are those emissions related to human activities.

Answer 2

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Emissions from transportation vehicles are a major source of pollution, especially in urban areas. They are major sources of both local urban pollutants, such as oxides of nitrogen, hydrocarbons, and carbon monoxide, and global greenhouse emissions, like.CO2 (They are a major source of noise pollution as well.)

Vehicle use creates not only emission of pollution, but also problems of congestion, especially in urban areas. While congestion is not the focus of this paper, many of the comments that follow could be applied to congestion and traffic problems as well, not only to vehicle emissions of pollutants. Policy alternatives that reduce vehicle emissions also frequently reduce congestion problems, and so produce two sets of social benefits.

Automobiles dominate the transportation and travel activities in industrialized countries (except Japan). Automobiles are also the main source of vehicle emissions and are the main component of travel-related energy usage in all high-usage OECD countries (Schipper et al. [5]). They have been the subject of concern by international conferences on air quality and global warming, such as the Rio Framework Convention on Climate Change and the United Nations Conference on Environment and Development.

The contribution of vehicle emissions to pollution is illustrated in Table 4.1, with numbers taken from several selected studies. As can be seen, for all categories of pollutants investigated in these studies, the share of vehicle pollutants is quite large.

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