Figure 2: The zonal level distribution of PAN for the present scenario during (a) J-J-A, (b) D-J-F. The percentage changes of zonal PAN between the base run and isoprene HOx recycling during (c) J-J-A, (d) D-J-F. (Note: Percentage change = (STOCHEM-ISOP - STOCHEM-base)*100/STOCHEM-base).