Fresh Polish (AHD, NGI, NGII) and Dutch (Sorbonorit 3, 4, RB 2, 3, 4) active C (1420 3-5%, sp. surface 700-1400 m(2)/g particle size 1.5-3.5 mm), intended to adsorb air-borne organics, were dried at 105degreesC and each was heated in a 140 x 50-mm glass column (under a 180 g dead-weight load) between two brass electrodes from 20degreesC to 100degreesC within 155 (Sorbonorit 4)-784 (AHD) s at 20 V(at 30 V, AHD reached 100degreesC in 250 s). Resistivities of Sorbonorit 3, 4 and RB 2, 3 (140-mm bed, 100degreesC) were examined at 15, 20, 25, and 30 V applied. Coefficients by rho(o) and T-o were evaluated (correlation coeffs. 0.993-0.999) in Baud et al.'s equation rho = rho(o)exp[b(T-1 - T-o(-1))(2)] at 15, 20, 25 and 30 V, relating resistivity rho (Omegaxm) to temperature T (degreesC). Norit's C were best, believed useful industrially, desorbable and regenerable by resistance heating. Polish C required either higher V applied or granulated graphite imbedded to enhance conductivity for regeneration.