Sulfur Dioxide and Nitrogen Dioxide
Sulfur Dioxide and Nitrogen Dioxide
Lower values were measured in the summer months, when emissions are also lower and the meteorological conditions for pollutant dilution are also more favorable. Long-term variability is seen in figure 6. It is noticeable that background concentration values exhibited a decrease parallel with a decrease in domestic sulfur dioxide emissions. It should be noted, however, that, as the atmospheric mean residual time of sulfur dioxide is just a few days, the domestic measurements reflect not only the effect of domestic sources but also that of those outside our borders. No significant trend was discernible for nitrogen dioxide. This is explained by the fact that the mostly traffic-related – nitrogen dioxide emissions have not varied substantially throughout the period investigated.
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