The objective of this chapter is to present a new air quality index, cityAIR, developed for urban contexts. Two air quality evaluation models are referred, both working in real time: a Canadian and a Portuguese experience. the one which concentration is higher given a certain scale. Typically these classification models consider only the worse pollutant, i.e. In order to find an air quality index, the pollutant concentrations are combined through a classification scale anchored on the legal limits and, on the other side, on the impacts over human health. When long-term data is considered, then we talk about long-term trend analysis, this kind of approach can be adequate for identifying the major emissionsource contributors to urban pollution ( Butterwick et al. Data is acquired through measurements made on an hourly or daily average basis and concentration episodes are evaluated and reported. Occasional evaluation is useful in the context of information and alert systems for the population, working normally in real or almost-real time. The evaluation of air quality may be occasional or long-term. The quantitative evaluation of traffic air pollution levels is the basis on which air pollution control policies stand. In urban environment the typical anthropogenic sources are mainly the road traffic and, when existing, the industrial activity. Problems related to quality of life in cities are increasingly relevant, especially with regard to environmental issues.ĭue to a generalised increase of mobility and road traffic in urban areas, the total emissions from road traffic have risen significantly, assuming the main responsibility for the disregard of air quality standards. Often, this enhances stresses on space, ecosystems, infrastructures, facilities and personal lifestyles. Global population growth has led to increased populations living in urban areas.
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