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1992 air quality in French urban, industrial and rural areas
1994
Stroebel, R. (Agence de l'Environnement et de la Maitrise de l'Energie, Paris (France))
Influence of the atmospheric conductivity on the ozone exposure of plants under ambient conditions: considerations for establishing ozone standards to protect vegetation
1994
Grunhage, L. | Jager, H.J. (Institute for Plant Ecology, Justus-Liebig-University, D-35392 Giessen, Heinrich-Buff-Ring 38 (Germany))
Polychlorinated dibenzo-p-dioxins (PCDDs) and furans (PCDFs) in urban air and deposition in the United Kingdom
1994
Duarte-Davidson, R. (Lancaster Univ. (United Kingdom). Inst. of Environmental and Biological Sciences) | Clayton, P. | Coleman, P. | Davis, B.J. | Halsall, C.J. | Harding-Jones, P. | Pettit, K. | Woodfield, M.J. | Jones, K.C.
Polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) have been monitored in air and deposition at four UK urban sites (London, Cardiff, Manchester and Stevenage) since the beginning of 1991; data from the first 2 years are presented here. Median Sigma 2,3,7,8-substituted PCDD/F concentrations in air were 3.2, 4.0, 3.5 and 2.6 pg/cubic metre respectively for London, Cardiff, Manchester and Stevenage. Median Sigma 2,3,7,8-substituted PCDD/F deposition fluxes were 1.5 ng/m** (2)/day in London, 1.4 ng/m** (2)/day in Cardiff and Manchester and 0.79 ng/m** (2)/day in Stevenage. Seasonal variations in the PCDD/F concentrations were observed at all sites for both air and deposition, with concentrations/fluxes generally elevated during the winter.
Afficher plus [+] Moins [-]A wind tunnel for measuring the gaseous losses of environmental chemicals from the soil/plant system under field-like conditions
1994
Stork, A. (Forschungszentrum Juelich GmbH (Germany). Inst. fuer Radioagronomie) | Witte, R. | Fuehr, F.
Volatilization from treated areas is a major source of pesticide residues in air, fog, and rain. This may lead to long-range transport of pesticide residues to remote areas. Up to now most information on pesticide volatilization has come from laboratory experiments under controlled conditions. A new system has been designed and developed to measure the volatile losses of (l4)C-labelled chemicals after application; the method compares with agricultural practice of treating soils or plants grown in lysimeters. Sensitive analytical methods guarantee a distinction between residues of unchanged pesticide, its metabolites or (14)CO2 as a mineralization product released into the air.
Afficher plus [+] Moins [-]The pollution potential and flows of nitrogen to waters and the atmosphere from grassland under grazing
1994
Jarvis, S.C. (AFRC Institute of Grassland and Environmental Research, North Wyke, Okehampton, Devon EX20 2SB (United Kingdom))