Study on atmospheric ozone levels in Izmir
Tez Türü: Doktora
Tezin Yürütüldüğü Kurum: Dokuz Eylül Üniversitesi, Fen Bilimleri Enstitüsü, Çevre Teknolojileri (Dr), Türkiye
Tez Danışmanı: Abdurrahman Bayram
Tezin Onay Tarihi: 2010
Tezin Dili: İngilizce
Özet:
The objectives of this study were to measure ozone concentrations in air and investigate ozone formation and degradation mechanisms in urban and suburban atmospheres in the city of Izmir. Ozone concentrations were measured at two urban and suburban sites in Izmir, Turkey. In addition to ozone, nitrogen oxide, nitrogen dioxide were also measured continuously at the suburban station. It was observed that ozone concentrations were at the lowest levels during rush hours of 07 00-09 00 based on the hourly results of continuous measurement devices. Nitrogen dioxide, resultant of a reaction between traffic based nitrogen oxide and ozone, showed high concentration levels during rush hours (morning time 07 00-09 00 and evening time 19 00-21 00). Highest ozone concentration levels were observed between May and August during the sampling period. The highest maximum level of European Union standard (180 microgram per cubic meter) was exceeded only during that timeframe. Whereas nitrogen dioxide concentrations were measured at well below the limit value of 200 microgram per cubic meter.
Ozone, nitrogen dioxide, and volatile organic compounds (VOCs) were also measured by diffusive sampling technique at 16 additional sites representing urban, industrial, and suburban areas in the study area of Izmir. As a result of these measurements, concentration changes due to area and time were noted for pollutants within the scope this study. Nitrogen dioxide, and VOC concentrations were relatively high at urban sites and industrial areas while ozone concentrations were higher at suburban sites. Ozone concentrations were higher at semi-suburban sites compared to other sites. The highest average weekly ozone concentrations were measured at two suburban sites.