SO₂ and VOC emissions belong to the first air pollutants which caused challenging experiences for cement industry. The reduction methods are particular for each cement plant, and are concerning the management of raw materials, combustibles or supplementary equipments and processes. The main raw material components responsible for SO₂ and VOC emissions are the pyritic sulfur as well as the kerogen. Current paper describes the complete replacement of an organic and pyritic rich clay source with a non-contaminated new one and the corresponding impact on the emission level. Compared with the old clay deposit, the new clay type with very low pyrite and TOC content has determined a strong reduction of SO₂ and VOC emissions.