The indoor air quality is outside the scope of the FWD, but the indoor air quality is
significantly influenced by the outdoor air quality, which means that outdoor air
quality monitoring is relevant for estimates of the contribution to the indoor exposure.
The suggested design of the network is i.e. based on experiences with design of
networks in Italy (Allegrini, 1996), Denmark (Palmgren, 1995) and discussions in the
working group. The NO2 levels in an urban area is a result of,
·the rural background air pollution, which is the NO2 pollution transported over
long distances, e.g. from other urban areas or by recirculation in the region. The air
pollutants have had time to react with other components of the atmosphere. The
rural background concentration is measured away from local emission sources.
·the urban background air pollution, which is the rural background plus the air
pollution from the urban area. This air pollution is a result of the emissions in the
city as a whole, the dispersion conditions and many chemical reactions. ,
·the local air pollution, which is the air pollution close to the emission sources, e.g.
traffic or point sources . Only the fastest chemical reactions are important for the
local emitted pollutants. The concentrations of these pollutants are mainly
determined by the dispersion.
Air pollution at all three levels must be taken into account in order to obtain a total
description of the NO2 pollution in an urban area.
n121 - n122 - n123 - n124 - n125 - n126 - n127 - n128 - n129 - n130 - n131 - n132 - n133 - n134 - n135 - n136 - n137 - n138 - n139 - n140 - n141 - n142 - n143 - n144 - n145 - n146 - n147 - n148 - n149 - n150
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