An Investigation of Local Anthropogenic Effects on Photochemical Air Pollution in Istanbul with Model Study
Urban ozone is a major pollutant produced by various sources as well as urban traffic through photochemical transformation of nitrogen oxides, carbon monoxide, and volatile organic compounds. Ozone pollution in urban areas is a complex problem involving both atmospheric diffusion processes, chemical reactions and transport. The superimposition of chemical production and physical processes leads to episodic level of photochemical air pollution under favorable meteorological conditions and abundance of precursors. The air quality of Istanbul has been a major concern since the early 1980s. The city has experienced several air pollution problems in 1980s. Usage of poor quality lignite was banned in late 1993. The fuel switching from coal to natural gas has gradually improved the air quality (Topcu et al., 2003). Today SO2 and TSP levels are below the national air quality standards. However, a new air pollution type has appeared in Istanbul that is the photochemical pollution. Surface ozone concentrations are increasing in the city depending on increasing numbers of cars that use mostly gasoline and poor dispersion conditions. Ozone episodes are frequently observed when anticyclonic pressure systems are in the vicinity of Istanbul.
KeywordsOzone Concentration Surface Ozone Surface Ozone Concentration High Ozone Concentration Ozone Pollution
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