Nonisothermal thermogravimetry was used to assess the susceptibility of coal and coal extracts toward combustion. Coal extracts were found less susceptible toward combustion than the nonextractable coal material. Combustion reactivity of the extracts depended on their chemical composition and structure. The extractable material in coal lowered the coal combustibility. This is likely due to the lower accessibility of reactive sites on the coal surface, which is partly protected from an oxygen attack by a layer of the extractable material on the pore walls. Removal of the extractable material led to a change of pore distribution and to a higher reactivity of the extraction residue toward combustion.