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In this study, quasicontinuous measurements of major aromatic volatile organic compounds (VOCs), which include benzene, toluene, ethylbenzene, and xylenes were carried out by means of an automatic gas chromatograph (GC-PID analyzer), in the urban air of Thessaloniki, at a mean level of 27 m above ground, during the years 2003 and 2004. The highest measured concentrations of aromatic hydrocarbons were observed during the winter period of the year. The data indicate that the annual mean benzene concentration levels were around 1 ppb, less than the E.U. annual limit value of 5.0 microg m(-3) (1.44 ppb at STP). The diurnal variation of aromatic hydrocarbons suggests that emissions from motor vehicles are their dominant source, at the commercial center of the city, while meteorological conditions (wind speed and direction) are important variables that control the atmospheric abundance of these pollutants, especially during stagnant weather conditions that favor the development of land-sea breeze circulations.

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Relationships between the bulk Richardson number, B, and other stability parameters were derived for the atmospheric surface layer. Nomograms were constructed, relating the Monin-Obukhov stability parameter, z/L, to B. The nomograms and the graph of Golder (1972) were used to establish various schemes for classifying z/L, B and Ri, in terms of the Pasquill stability classes.

The variation of the wind profile power-law exponent (p) with respect to changes in atmospheric stability is depicted using the formulation of Ku et al. (1987) for specifying the MoninObukhov scaling length (L) under stable atmospheric conditions. The theoretical estimates for the bulk approximation of p as a function of L under stable conditions compare well with power-law exponent data from various sources and the theoretical analysis from Irwin (1979).

Debo Ajagunna Adebowale Olufunso (Debo) Ajagunna-Brief Biography Adebowale Olufunso (Debo) Ajagunna, a native of Nigeria moved to Greece and obtained his PhD in Physics from the University of Crete in 2011. His thesis was entitled "Heteroepitaxy of InN on silicon (111) and R-Plane sapphire substrates [1] " and it was performed under the supervision of Prof. Alexandros Georgakilas. [2] At the time he also served a church in Heraklion. The church is composed of expatriate converts, many of them from Nigeria. Afther his PhD Debo return back to Nigeria, to be with his wife and three children. On May 1, 2012 he was praying with members of his former congregation in Ikare-Akoko, a city in the southwestern Nigerian state of Ondo, when armed robbers entered the church building."Everyone ran for their life," said Eleni Melirrytos, a member of the Omonia Church of Christ in Athens, Greece, and longtime friend of Ajagunna. "There was a pregnant lady who got shot and was asking for help. Debo had already left the room but came back to help her. That is when he got shot." Ajagunna died from his injuries. The pregnant woman (and her unborn child) survived the attack.