constitutes a comparison between the total accumulation of error
from simulations with sectors varying independently and the total
error produced by a simulation in which the same sectors varied
simultaneously. This test was applied with guidance from Schöpp
et al. (2005) and Bennett et al. (2013). The analysis focused on
NO2 due to the fact that it is a primary pollutant that also participates
in the complex interplay of particulate matter and O3 formation,
so an indirect picture of the general behaviour of the
approach for other pollutants can be obtained. The rest of pollutants
were not evaluated with the additivity test due to limitations
in computing-time. The analysis was carried out by defining a
simple hypothetic scenario (HS), with a definite number of sectors
(S1, S2, .SN) whose NOx emissions were varied. Each of these variations
was processed separately with AERIS and the ordinary
AQMS and their respective results compared. The HS was also
simulated completely by both models and the obtained estimates
compared. We assessed whether the following condition was fulfilled
for three different thresholds (t) of 0.5, 1.0 and 1.5 mg/m3 (Eq.
(8)):