Smoke evolution in a smoke chamber 750 x 750 x 1000 +/- 5 mm (Polish Standard PN-91/K-02501 equivalent to UIC 561-OR 1991) was studied in, and the oxygen index flammability test (Polish Standard PN-76/C-89020) was carried out for, glass-reinforced polyester (GRP) laminates obtained with unsaturated polyester (UP) resins containing chlorine and bromine in the chain. In these studies, the effect on these properties of such additives as ZnSnO3, (ZS), ZnSn(OH)(6) (ZHS), AI(OH)(3), or Mg(OH), and Sb2O3 in up to 30 mass % was determined. The most efficient ignition and smoke-evolution retarder from among the investigated compounds were ZS and ZHS, and an essential reduction in smoke evolution was also observed with Sb2O3. GRP laminates with these additives meet the fire safety recommendations concerning smoke evolution for materials used in transportation and in the building industry.