Most atmospheric models that treat biomass burning organic aerosols, and organic aerosols in general, consider them as single-phased particles for gas-particle partitioning calculations. In addition, some models have treated primary organic aerosols and secondary organic aerosols as two separate phases. The results herein show that BBOA, at least in regions where forests primarily consist of pine trees, should be treated as having two separate phases. Depending on the degree of internal/external mixing of BBOA in forest fire plumes, these two phases may coexist and be separated within individual particles. This is without considering the mixing state of soot/black carbon (BC) with BBOA in wildfire plumes, which can also have different degrees of internal and external mixing and depends on the age of the plume. BC may be coated with a layer of BBOA, so if the BBOA is phase-separated, it is possible to have BC cores engulfed in 2 distinct layers of BBOA.