Synchronous scanning over a range of excitation wavelengths and fluorescence measurements were used to study polystyrene, solid solutions of luminophores in poly(methyl methacrylate (PMMA), and methyl methacrylate copolymers doped with pyrene, anthracene, and naphthalene. The complicated nature of the aggregation of aromatic hydrocarbons in solid polymers is revealed. The origin of their excimer-like fluorescence is also discussed.