In this study, the relationship between air quality and fog incident was analyzed for Istanbul-Yenibosna region. In this direction, two types of data which were obtained from Yenibosna Air Quality Measurement Station and Istanbul Ataturk International Airport's weather reports were examined for a nine-year period (2007-2015). According to the hourly average values of SO2, PM10 and CO air pollutants for monthly, seasonal and annual bases, the average concentrations of these pollutants were higher on foggy days when compared to the average values of all days. Also within the period covered in the study, fog incident has not been reported for five months period (May to September). Finally, an inverse relationship between the prevailing visibility and pressure values was found as the outcome of the study.