The concentration of NO2in all temporal and spatial scales is determined by the total
emission in the region, dispersion of pollutants, deposition of NO2, many complicated
chemical transformations and by the long range transport of nitrogen compounds.
In rural areas, far from air pollution sources the temporal and spatial variations of the
NO2 concentrations are relatively small. In these areas the limit value for protection
of vegetation is important, i.e. the annual average concentration. However, for
protection of vegetation, deposition in relation to critical load will often be even more
critical. There is no simple linear relationship between the emission of nitrogen
compounds between regions and the concentration of NO2 in the air. However,
advanced large scale models such as the EMEP model, based on data from European
emission inventories, meteorological data and the atmospheric chemical and physical
processes, have been established and can be used to estimate the concentrations of
NO2 (and O3) in rural areas (Barrett et al. 1995), (Simpson 1992), (Simpson 1993).
In urban background areas where local sources have a more direct impact on the NO2
concentration, no linear relationship between the emission of nitrogen oxides and the
NO2 concentration here either. Urban background is often representative for
residential areas and thus for human exposure; the long term as well as the short term
limit values may be critical.
n151 - n152 - n153 - n154 - n155 - n156 - n157 - n158 - n159 - n160 - n161 - n162 - n163 - n164 - n165 - n166 - n167 - n168 - n169 - n170 - n171 - n172 - n173 - n174 - n175 - n176 - n177 - n178 - n179 - n180 - n181 - n182 - n183 - n184 - n185 - n186 - n187 - n188 - n189 - n190 - n191 - n192 - n193 - n194 - n195 - n196 - n197 - n198 - n199 - n200
castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD