Dear Colleagues,

Tropospheric ozone (O₃) is a secondary air pollutant formed in a complex photochemical reaction. It is one of the key air pollutants, a major component of photochemical smog, and a strong oxidant which plays an important role in the oxidative capacity of atmosphere. Many places in Europe become subject to seasonal changes of ozone concentration with typical minimum concentration in winter and maximum in summer. The episodes of high concentration of ozone occur every summer in a number of European urbanized areas. During these episodes, many of which last for several consecutive days, ozone concentrations rise to several times the boundary layer background. That phenomenon often occurs under anticyclonic conditions related to increased sunlight duration, considerably high temperatures, and lower wind speed. In the urban and suburban situation, high concentrations happen mainly due to photochemical production from precursors that are emitted from known but also unknown and presently sought sources.

This Special Issue is expected to be not only the forum of information exchange on the presence and variability of ozone concentration in different parts of the world, but also to involve:

• The behavior and presence of ozone precursors in different topographical, meteorological, and emission conditions;
• Long-term trends of ozone precursor emission and their relationships with tropospheric ozone;
• Estimations and forecasts of population exposure to ozone in different conditions and scenarios;
• Air quality considering the intensity of secondary pollutants formation, such as tropospheric ozone and secondary organic and inorganic aerosol;
• Relationships between the secondary atmospheric aerosol and tropospheric ozone;
• Influence, forecast, and modeling relationships between temporary and long-term climate changes, meteorological conditions, and fluctuations of tropospheric ozone concentration;
• Other issues.

Prof. Dr. Grzegorz Majewski
Prof. Dr. Wioletta Rogula-Kozłowska
Guest Editors

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• Ozone
• Gaseous precursors
• Secondary aerosol
• Anthropogenic emission
• Air quality
• Meteorological conditions
• Climate changes
• Seasonal cycle
• Atmospheric chemistry model
• Urban heat island
• Photochemical smog
• Communication emission
• Nitrogen oxides
• UV radiation