Figure 7: Spatial structure of climatological NO_x in July, derived from HALOE satellite measurements at 100 hPa (left),
and from a MOZART3 simulation at 158 hPa (right).  The HALOE data are a sum of the sunset measurements of NO and NO₂,
while the MOZART3 results show a full diurnal average.  Note the relative maxima over the South Asian and North American
summer monsoon regions, probably due to lightning generation of NO_x.