O(3), NO(2), SO(2), CO and PM(10) concentrations, simultaneously determined for the first time in Belgrade urban area in the autumnal period of 2005, are presented. The obtained results display similar behaviour of SO(2), NO(2), CO, PM(10) opposite from that of O(3). The weekend effect was also investigated showing diminution of average daily concentrations of SO(2), NO(2), PM(10) and CO for 72, 40, 37 and 42% respectively, and increase of the average daily concentration of O(3) for 56%. Influence of meteorological conditions on observed concentration levels was studied, too. The observed influence of wind speed on the O(3) nightly concentration levels was analyzed pointing to the phenomena of O(3) transport during episodic measurements. To make an identification of possible pollution sources and analyse the influence of meteorological parameters on pollution levels, air back trajectories for high level concentrations episodes were calculated and analysed. A multivariate receptor modelling (Principal Component Analysis, Cluster Analysis) has been applied to a set of data in order to determine the contribution of different sources. It was found that the main principal components, extracted from the air pollution data, were related to gasoline combustion, oil combustion and ozone transport.

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During the period between June and December 2002, the concentrations of ozone in the air at 4 measuring sites in Belgrade were measured. The measuring periods varied from 10 days to several weeks. The maximal measured daily concentrations of ozone ranged from 19ppbv (23 December 2002) to 118ppbv (23 June 2002).Ozone concentrations higher than, or equal to 90ppbv were registered at three measuring sites. It was shown that at measuring sites characterized as urban, maximal O3 concentrations equal to, or higher than 90ppbv occurred at high temperatures (higher than 30?C) and low wind speeds (mostly from the north). The measured ozone concentrations mostly showed characteristics usual for a daily photochemical ozone cycle, excluding the specificities influenced by the measuring site itself. Ozone transport was recorded at increased wind speeds, primarily from south-easterly directions. On the basis of he correlations between ozone concentration and the corresponding meteorological parameters, a validation of the measuring sites was performed from the aspect of their representativeness for the measurements.

This article highlights how "place-based education" can be used to raise awareness about sustainability and potentially influence design process decisions that have environmental and cultural implications. "Place-based education" is a term used to describe an educational worldview based on development of curriculum centered on the local, social, economic, and ecological resources of a community. The study shows results of Masters Students' research on situating a housing complex in the context of the agrarian landscape of Vojvodina, Serbia, considering it as a resource for a new sustainable urban lifestyle. During the first year of Masters Studies at the Faculty of Architecture, Belgrade University, an architectural design studio with 15 students had the task of exploring the potential of expanding the city of Belgrade across the agrarian landscape, as to affirm the role of place in contemporary everyday life. Students were expected to explore the possibilities and limitations of the relationship between man and agrarian landscape via architecture, re-thinking how various architectural design approaches could balance and harmonize the impact of the built environment on the agrarian landscape. The paper shows that "place-based education" possesses elements necessary for the inclusion of a wider spatial-cultural context in the process of architectural design and prioritization of environmental literacy and responsibility, as one of the main components of sustainable development. OPEN ACCESSSustainability 2015, 7 9712

The uptake and distribution of arsenic (As) and some heavy metals was determined in three Viola endemic species from As-overloaded soil in an abandoned mine at Alchar, Republic of Macedonia (FYROM -The Former Yugoslav Republic of Macedonia). Some essential elements were also analyzed in order to characterize the common geochemical properties of this site. Total As content in soil ranged from 3347 to 14,467 mg kg − 1 , and plant available As from 23 to 1589 mg kg − 1 . The concentration of As in roots ranged from 783 mg kg − 1 in Viola macedonica to 2124 mg kg − 1 in Viola arsenica . Only a small amount of As accumulated in the aboveground parts of these species (<100 mg kg − 1 ), while in shoots of Viola allchariensis , As accumulated in the range 187-439 mg kg − 1 . Arsenic accumulation in the roots of these Viola species may make these plants valuable tools for the bioindication and phytoremediation (phytostabilization) of As in naturally loaded and anthropogenically contaminated soils.