ESTIMATING STREET-CANYON AIR-QUALITY LEVELS USING DIFFERENT FITTED PROBABILITY-DISTRIBUTIONS

The main purpose of this study is to analyse the diurnal variability o f air pollutants (e.g, carbon monoxide, sulphur dioxide, nitric oxide, nitrogen dioxide, ozone and smoke) using different fitted probability density functions and establish the relationship between emissions st andards and street-canyon air quality levels in the commercial center of Thessaloniki. Particular attention is given to the dynamic behavior of motor vehicle emissions, which constitute the most important singl e source of pollutants in the commercial region of the town.