NOx gas, which is released into the atmosphere from automobile exhaust and fossil fuel combustion, is a major air pollutant. The application of the photocatalytic technique to mitigate the concentration of NOx in the atmosphere is preferable because it is environmentally friendly, simple, and inexpensive. In this work, palladium nanoparticles (Pd NPs) were decorated on TiO2 nanotubes (TNTs) by gamma-ray irradiation, and degradation of nitrogen monoxide (NO) was applied to evaluate the photocatalysis of the as-prepared Pd/TNT materials under atmospheric conditions. The results demonstrated that the Pd/TNT material with a 14 kGγ dose is the best photocatalyst, achieving 53.30 % NO removal efficiency, which is 1.6 times greater than that of pure TNTs. Furthermore, the decomposition of NO on the Pd/TNT catalysts also generated less NO2 poisoning under both solar and visible light conditions. Additionally, they possess desirable properties such as reusability, low toxicity, and high apparent quantum efficiency (AQE).