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This work aimed to evaluate the effects of C₂H₆, C₂H₄, CO, H₂, and their mixture on the explosion characteristics of CH₄. The flammable limits tests were performed in an upward propagation cylindrical vessel with a volume of 3.4 L. The explosion properties of the mixtures were tested in a standard 20 L spherical chamber. All experiments were conducted at room temperature and at ambient pressure, with a relative humidity range from 52 to 73%. The parameters of flammable limits (upper flammable limit (UFL) and lower flammable limit (LFL)), explosion risk value (F), peak explosion pressure (P_max), maximum pressure rise rate ((d_p/d_t)_max), and the gas deflagration index (K_G) were observed and analyzed. The laminar burning velocity (S_L) of the mixtures was determined by an outwardly propagating spherical flame method. The results indicated that the existence of C₂H₆, C₂H₄, CO, H₂, and their mixture …