Ulviye Özer

Ozone concentrations at a rural mountain site of Northwestern Turkey

Average ozone concentrations at a remote site in the Uludag Mountain of Northwestern Turkey was 29 ppb for a 12 month period. Only 11% of the time 1-h average values exceed 50 ppb. The US Air Quality Standard of 0.12 ppm was not exceeded. The diurnal variations of O3 and NO2 were 27 and 2.3 ppb respectively, during summer 1993, indicating the impact of urban and industrial sources. Highest O3 concentrations were observed under southerly and northerly winds, suggestive of the transport of photochemically produced oxidants from Bursa city and industries and a power plant located downwind of the sampling site.

Measurement of Ambient Concentration and Surface Fluxes of O3, SO2 NOx and TSP in Uludag National Park

Uludag station is situated in the northwest part of the Turkey at longitude 40° 101 N, and latitude 20° 081 E (Fig. 9.7.1). The station is operated by the Middle East Technical University and Uludag University. Based on the fact that fluctuation of ambient concentration results in the changes in the vertical fluxes, first ambient concentration data were obtained. Starting in March 1993, measurements of O3, NOx, SO2 and TSP concentration at ground level have been made continuously. Meteorological parameters wind direction, wind speed, temperature and humidity were also measured continuously. Hard winter conditions at the Uludag mountain site (average snow-fall is about 1.5m) resulted in some technical problems with the instruments, which in turn resulted in some gaps in the data.