The highest concentrations in urban areas are alongside busy roads. Measurements

show that roadside NO2 levels can exceed WHO AQGs (1987) by a factor of 2 - 4

depending on actual traffic and dispersion conditions. Persons living close to or

working in the street environment are often highly exposed to nitrogen oxides and

other traffic-related pollutants.

Model calculations using the EMEP model (Barrett et al,. 1995) indicate that high

NO2 concentration is mainly an urban pollution problem. The concentration of NO2

in rural areas does not exceed the 1987 daily WHO AQG (150 mg/m3 ), except in

areas, where local emission sources influence the situation (Figure 1.3).

 

 

 

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