Effective evaluation of air pollution
control strategies requires the use of validated
and reliable mathematical models that can relate
pollutant emissions to atmospheric air quality.
The derivation and use of such models, at least
for inert and linearly decaying pollutants such
as CO and SO_2, has received a great deal of
attention. Much less work has been devoted to
assessing how the model predictions are related
to actual atmospheric concentrations. The
objectives of this paper are to formulate the
concepts of validity and accuracy and to suggest
and describe some experiments that can be performed
to assess these features
