In the present research, polyaniline assisted by TiO2:SnO2 nanoparticles was synthesized and deposited onto an epoxy glass substrate with Cu-interdigited electrodes for gas sensing application. To examine the efficiency of the polyaniline/TiO2:SnO(2)nanocomposite (PTS) as a hydrogen (H-2) gas sensor, its nature, stability, response, recovery/response time have been studied with a special focus on its ability to work at environmental conditions. H-2 gas sensing results demonstrated that a PTS sensor with 20 and 10 wt% of anatase-TiO2 and SnO2 nanoparticles, respectively, has the best response time (75 s) with a recovery time of 117s at environmental conditions. The highest (lowest) response (recovery time) was 6.18 (46s) in PTS sensor with 30 and 15 wt% of anatase- (rutile-)TiO2 and SnO(2)nanoparticles, respectively, at 0.8 vol.% H2 gas. Further, the H2 gas sensing mechanism of PTS sensor has also been studied. (C) 2014 Elsevier B.V. All rights reserved.