Author(s)

S. Andreani-Aksoyoglu, W.R. Graber & J. Keller

Abstract

The photochemical smog situation in Switzerland on July 29, 1993 was simulated using the 3- dimensional grid model UAM (Urban Airshed Model). Results were compared with the field measurements. The calculations showed that ozone formation in Switzerland is mainly NO_x limited. However, some areas seem also to be sensitive to VOC emissions. Calculation of dry deposition of the pollutants indicated that most of the O₃ formed over the Swiss Plateau is deposited in the Alpine regions which have high forest coverage. The impact of biogenic VOC on O₃ concentrations was predicted to be small (<5%). Their effect on PAN and H₂O₂ concentrations however, is found to be significant.

Keywords