Urban traffic pollution

Outdoor air always contains “air pollution” in the form of gases and particles. The amounts and effects of these pollutants are what determine air quality.

The air quality in cities at times exceeds recommended air quality levels and can lead to negative consequences for human health and the environment. These health effects are particularly problematic in cities, because by their nature cities contain large numbers of people who can be exposed to high concentrations of pollutants. In Norway, the highest pollution levels usually result from a combination of emissions near the ground and special meteorological and topographic conditions.

Particles, nitrogen oxides and oxidants (ozone) are all substances that can cause health-related effects. Ozone and particulates are also of interest in terms of health effects on a regional scale. Organic and inorganic pollutants can be important both at a local and regional scale. Pollution from automobile traffic has become a substantial problem for city residents both in terms of health and well-being.

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