Extract PM2.5 concentration

[fpw]

I am currently using WRF-chem4.6, and my chemical mechanism employs chem_opt=2, which corresponds to RADM2
chemical mechanism and MADE/SORGAM aerosols. In the wrfout file I generated, there is a variable named "PM2_5_DRY". Can this variable represent the total concentration of PM2.5? Or should I add other relevant variables, such as SO4 and NO3, to obtain the total concentration of PM2.5.
Any response would be helpful to me. Thank you all!

 

[fpw]

Additionally, I need to add that I used WRF-Chem to simulate PM2.5 and O3 in Beijing in July. However, in the results I extracted for the variable "PM2_5_DRY", the values were all between 0-1 ug m^-3, which is far lower than the actual monitored concentrations. Therefore, I have raised questions about how to extract PM2.5 concentrations in WRF-Chem