SPREDNINGSMØNSTER VED LOKAL LUFTFORURENSNING I GRENLAND-REGIONEN

The dispersion conditions at a planned industrial site, Rafnes - Rønningen, and at an existing industrial complex, Herøya, in Telemark, are studied based upon meteorological data from several stations in the area. Local wind patterns are related to wind at a reference station (Lakollen, 235 m.a.s.l.). The wind frequency distributions for shorter periods are related to a "normal" wind distribution. A relationship between observed smoke dispersion and -transport from Herøya and observed wind and lapse rate (stability) in the atmosphere around Herøya is established, to evaluate the typical wind/stability - frequency distribution for a "model-year". Dispersion models (multiple-source-, area-source- and single-stack-types) based on Gaussian distributed concentration profiles are applied to calculate seasonal and annual average ground-level concentration distributions ("dispersion patterns"). These dispersion patterns are presented on topographical maps for different emission conditions, and represent a basis for area planning through their visualization of the areas which might be exposed for air pollution in the future.