Treatment of Black Carbon in CMAQ simulation

Hi all,
I am confusing about the treatment of black carbon in CMAQ simulation. As far as I know from Hu et al.,(, the Elemental carbon (EC) in the CMAQ model is black carbon, am I right?
If it is, may I ask what is the corresponding variable of black carbon in emission file under the CB6r3 mechanism? Can I just use the PM25_EC in the combined CCTM out file to represent black carbon in PM2.5?

Any comments or suggestions are highly appreciated!
@hogrefe.christian @cgnolte