Many toxic substances in the workplace can modify human health and quality of life and there is still insufficient data on respiratory outcomes in adults exposed to phthalates. The aim of this work was to assess in waste management workers from the Nitra region of Slovakia (n = 30) the extent of exposure to phthalates and health-related outcomes. Four urinary phthalate metabolites mono(2-ethylhexyl) phthalate (MEHP), monobutyl phthalate (MnBP), monoethyl phthalate (MEP) and monoisononyl phthalate (MiNP) were determined by high-performance liquid chromatography with mass spectrometry (HPLC-MS/MS). Urinary concentration of MEHP was positively associated with ratio of forced expiratory volume in 1 s to forced vital capacity % (FEV1/FVC) (r = 0.431; p = 0.018) and MiNP with fat free mass index (FFMI) (r = 0.439; p = 0.015). The strongest predictor of pulmonary function was the pack/year index as smoking history that predicted a decrease of pulmonary parameters, the FEV1/FVC, % of predicted values of peak expiratory flow (PEF % of PV) and FEV1 % of PV. Unexpectedly, urinary MEHP and MINP were positively associated with pulmonary function expressed as PEF % of PV and FEV1/FVC. We hypothesize that occupational exposure to phthalates estimated from urinary metabolites (MEHP, MiNP) can modify pulmonary function on top of lifestyle factors.

Vegetation formations are an important component in the urban structure, as they perform a wide range of ecosystem services there. The climate modification to improve the environmental and residential quality of the city is one of the important functions. The paper presents the results of the microclimate assessment in the chosen localities of Nitra town, Slovakia, with an emphasis on the stage and differences in air temperature and relative humidity. The climate elements were measured at 7 spatially different sites (sites A to G), each of them at two comparative sites, vegetation stand and open area. The largest average air temperature difference between the vegetation stand and the non-vegetation area was 1.2 °C at the locality D. The largest air temperature difference in the vegetation stands was measured between the street space (site E) and the city park (F), reaching 2.3–2.5 °C. The relative air humidity reached the highest differences between the park (locality F) and the street space (G) measured at 3:00–8:00. These reached 19.6% to 24.4% with higher relative humidity in the popular city park. The highest differences between the compared habitats were measured at locality G and averaged 9.6% at 04:00 – 07:00 in a preference to a tree canopy. The research results confirmed the importance of the vegetation structures in the process of mitigating the urban climate extremes and the environmental quality improving.

This work deals with the innovated complex process of tree risk assessment, from precise geometrical tree shape acquisition to building and analyzing a finite element model under specified load. The acquisition of the 3D geometry of the tree was performed by means of terrestrial laser scanning. Obtained point cloud was optimized and additionally converted to a 3D CAD model, representing the bearing skeleton compound of trunk and main branches. For structural analysis purposes, a finite element model (FEM) was built in the form of beam structure fixed to the ground. Particular beams were defined by geometry, material properties of wood, and cross sections. An acoustic tomography was applied for determination of the precise cross section on investigated locations of an analysis model. Finite element analysis performed on the computational model shows the bearing capacity and deformations of the whole tree structure caused by combinations of load cases like self-weight and static equivalent of wind load. The results of the structural analysis called attention to potentially dangerous places within the tree structure with extreme node displacements or tensile stresses on beams. Thus, we observed a maximal horizontal displacement of 280.4 mm in node N34 and dangerous tensile stress in node N26, where it reaches +23.6 MPa. After filtering some beams with an abnormal cross section geometry, the finite element analysis of the whole tree structure showed the highest tensile stress of +8.8 MPa and highest compressive stress of −8.9 MPa. The suggested method can be applied generally for the prediction of potentially risky tree suspected of breakage and especially for monumental trees, where the presented method can be mostly applicable.

AbstractCultural ecosystem services (CES) are mainly intangible benefits, obtained by aesthetical and other experiences, recreation, learning and spiritual enrichment, or by the ability to distinguish values. In other words, what makes a service ‘cultural’ is its ‘non-economical’ character. CES are ecosystem services with direct impact on the quality of life in urban systems, and they are directly appreciated by inhabitants and visitors of these urban systems (Plieningeret al., 2013; Zulian et al., 2018). In order to satisfy the needs and expectations of the wider urban community, a ‘broader portfolio of areas’ is needed, which can meet the expectations of different users, from children to older adults. The new methodological approach tested on three model areas in the city of Nitra in the housing estate Chrenová was used to establish the level of benefits provided by existing vegetation areas in urban environment in terms of recreation as a CES. Following data were collected: the quality of vegetation, spatial design, management of vegetation elements, selected environmental aspects, available amenities and architectural elements needed for recreation. In our article, we present the assessment of vegetation in relation to the provision of recreation as a CES. Our results show that the assessed areas can be classified in the category of average to low provision of benefits related to recreation. Vegetation on area P1 is in good condition, mainly the quality of trees and shrubs was assessed as very good (4). Other areas (P2 and P3) assessed provide only low levels of benefits derived from recreation as one of the CES. This was caused by some vegetation deficiencies (mainly related to horticultural and compositional aspects). Methodological approach can be used for different vegetation areas in urban environment and after suitable modifications (e.g. adding other components for assessment) also for different cultural ecosystems services. The results can be used in landscape planning documents or in other types of documents dealing with the quality of vegetation in urban environment.

Klein J., Rózová Z.: Methods of trees evaluation with the site-specific effect for microclimate in urban environment: the case of study Nitra (Slovakia). Ekológia (Bratislava), Vol. 36, No. 1, p. 40-51, 2017. Microclimatic factors in selected vegetation structures have been monitored in a compact historical built-up layout in the Nitra municipality. We have observed relationship between microclimatic factors (air temperature, relative air humidity and surface temperature) and microclimatic environment indices (MEI). MEI were created for selected trees with varied structure on the basis of synthesis of input data (layout samples of canopy layer and urban geometry). They point out the impact of trees and environment on microclimate in an urban environment during hot days. Surface temperature is a significant factor. The model shows that the surface temperature in various structures of trees and varied urban geometry could be identified through MEI. From the microclimatic point of view, the tree cover in the narrow street with 8 MEI has the greatest cooling effect. MEI from 8 to 13 proved the cooling effect with regard to the general diameter of the area. The higher the number of MEI, the lower is the cooling effect of the trees.