The adsorption of NO2 oil active carbons obtained from Polish bituminous coal Was Studied. Carbonaceous adsorbents were obtained by pyrolysis of coal Lit 500, 600, and 700 degrees C followed by activation with KOH Lit 700 degrees C. Adsorption of NO2 was carried Out from dry and moist (70% humidity) air. The surface Structure and chemistry of the initial and exhausted adsorbents were analyzed using adsorption of nitrogen, Boehm method. and elemental and thermal analyses. All adsorbents obtained were found to have acidic surfaces. The best NO2 sorption capacity in both dry and wet conditions was obtained for the active carbon pyrolyzed at 700 degrees C. with respective Values of 25.0 and 43.5 mg/g, respectively. For all materials a considerable amount of NO2 was reduced to NO. Differential thermogravimetry curves of Samples after exposure to NO2 showed two new peaks, the first at 90-180 degrees C, assigned to the removal of physically adsorbed NO2 and NO, and the second at 200-400 degrees C. assigned to the decomposition of potassium nitrates and nitrites.