Methane (CH₄) is a potent greenhouse gas with a global warming potential far greater than that of carbon dioxide. Wastewater treatment plants (WWTPs) are notable sources of low-concentration methane emissions, which are challenging to treat using conventional methods. This study investigates the potential of photocatalysis as a low-energy approach for methane decomposition under ambient conditions. Two metal oxide photocatalysts, titanium dioxide (TiO₂) and zinc oxide (ZnO), were tested under ultraviolet (UV) light to evaluate their efficiency in methane degradation. Experiments using air containing approximately 2 ppm CH₄ showed no significant methane conversion under the applied conditions, indicating that improvements in light intensity, reactor design, and catalyst modification are needed. A complementary feasibility analysis based on Ag–ZnO photocatalyst data demonstrated a maximum instantaneous efficiency of 23.7% under high solar irradiation, with an annual average efficiency of about 5%. Although results confirm photocatalysis as a promising concept for methane reduction, current limitations in catalyst stability and efficiency hinder large-scale implementation.