Hi,
I also encountered zero sensitivity coefficients (O3 to NOx or VOCs emssions) when I ran CMAQv5.3.2 and v5.3.3 while I got too high second-order sensitivity coefficients using CMAQv5.4 as reported in CMAQv5.4 HDDM gives too high second order sensitivity. I would be appreciate if someone could help us to solve the problem