The presented numerical model has been developed in the
framework of project “Air Pollution in Prague” at the
Department of Meteorology and Environmental Protection,
Faculty of Mathematics and Physics, Charles University
in Prague during 1995-8. It serves as a tool for
studying summer photochemical smog episodes. Such
episodes can be described as a presence of high ozone
concentration produced by photochemical reactions of its
precursors, as nitrogen oxides - NOx and volatile organic
compounds - VOC.
The model has conceptual base in the category of socalled
“puff’ models. The principle of this type of models
consists in hacking of air-pollution plumes into series of
puffs. Plume is then supplied by sequence of partly overlapped
elements drifted by wind flow from source location
down the trajectory. That approach allows to reply to
quickly changed meteorological conditions and emissions,
however the main advantage is ability to involve mixing and mutual chemical reacting parts of plumes proceeded
from different sources.