Figure 2-3: Maximum percentage increase in ozone concentrations, in
principal traffic areas, in the 9- to 13-km altitude range, 30-60�N latitude
range, during summer, normalized by assumed global aircraft NOx emission to
0.5 Tg N yr-1 and plotted against the year the calculation was performed.
Each point represents a particular model study, with the lines showing the
one standard deviation (1xsd) range of results.
