Photolysis of NO2 in SAPRC07

Dear CMAQ forum,

I am using saprc07tc_ae6_aq in CMAQv5.2. In my recent simulation for the summer season, surface ozone concentrations were calculated very low. In that simulation, I used emissions data that had shown reasonable results in the past.

I checked PHOTODIAG2 and found that NO2_06 was almost zero, as shown in the attached. So, I thought that NO2 photolysis was not calculated. Does anyone know about the reason for this NO2_06 to be zero?

Appreciate your kind help.