Where can I change emissions import ratio between Aitken and accumulation?

I want to know where can I change Emission default settings.
Simulated fine particle number concentrations by CMAQ, as initial ratio of particle emissions in the Aitken (Ei) and accumulation (Ej) modes.

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I’m not sure exactly what you are trying to do, but I believe you want to change the splits for ‘FINE_REF’ in em_aero_ref in AERO_DATA.F.

Emission input for Fine particles in CMAQ distributes Aitken and Accumulation modes as 0.001:0.999.
I am not sure I can change the number of ratios in CMAQ.

You are correct that fine particle emissions used to be apportioned by mass in ratios of 0.001:0.999.
However, this was changed with CMAQv5.1, released in November 2015. Since then we have used a 0.1:0.9 ratio, as shown in the table in AERO_DATA.F referenced above.

https://www.airqualitymodeling.org/index.php/CMAQv5.1_Aerosol_size_dist

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Oh! I had old knowledge. I have checked it!

Thank you very much!!