This study includes a simple and very general evaluation of sulphurdioxide (SO2) and particulate matter (PM) data on the ambient air of the city centers in Turkey. Annual averages Of SO2 and PM data were studied between 1993-2002 during the winter season (October-March). It was observed that lignite, which is commonly used for heating in Turkey, is a significant component Of SO2 and PM formation. Variation of SO2 and PM data in the city centers that consume natural gas was compared with the data of some city centers that do not consume natural gas. It was observed that SO2 and PM averages of the city centers that started to consume natural gas have regularly diminished.