Dear Gummibaer,
Thank for your help. In fact , I want to correct initial try of OZ _p, NO_p and NO2_P from OZ _p_NEW ,NO _p_NEW and NO2 _p_NEW. So, the 3th loop (based on your nomination) should continue for each I and j until SUM_Relative(i,j) become less than 1.ٍElse,it should continue with...