Abstract
A number of primary and secondary pollutants interact under the influence of solar radiation. These may be monitored at fixed sites or by a mobile monitoring van using chemiluminescence for nitrogen oxides. These data were available from PERPA, the Greek Pollution Control Unit. General monitoring of nitrogen dioxide may be achieved at less cost using diffusion tubes located at suitable points along streets and buildings. This method was investigated during one week in September 1989. Particular attention was given to the characteristics of the built environment as well as meteorological conditions in the boundary layer. The results indicate relatively low levels of photochemical pollutants during the monitoring period.
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