The electrical conductivity both dc and ac of polypyrrole doped with β-naphthalenesulfonicacid (NSA) and polypyrrole-polymethyl methacrylate blends have been investigated in the temperature range of 300-80K and in the frequency range of 100-10MHz. Samples are prepared by in situ polymerisation technique using the common solvent meta cresol. The frequency dependence of conductivity satisfies the power law, σ(ω)≃ω s , with s=0.73-0.95. In PPY-NSA, s is independent of temperature and explained by electron tunneling model whereas in PPY(NSA)-PMMA blend s decreases with temperature and the ac mechanism is predicted by the overlapping polaron tunneling. The ac conductivity σ(ω) as a function of temperature follows the scaling law, σ(ω)/σ 0 =1+(ω/ω 0 ) n with n~0.85.