In order to assess the relative contribution of UFC restaurants to atmospheric PM levels in Seoul (as of 2008), the latest emission ratio data (as of 2007) for all available air pollutants in Seoul were obtained[27]. As shown in Fig. 1B, PM10 released from UFC restaurants can contribute to about 2.4% of the ambient PM10 levels in Seoul. As PM2.5 and TSP are not regulatory air pollutants in Korea, the relative contributions of PM2.5 and TSP were not estimated; their source apportionments are not yet established as the component of Korean emission inventory. Considering the PM2.5/PM10 ratio (0.73–1.00: this study) and the fraction of PM10 (92.2–99.8%) to TSP[17], PM2.5 should be the predominant component of
airborne particles produced from UFC. Consequently, it is projected that the contribution of PM2.5 from UFC restaurants should be much greater to atmospheric PM composition than that of PM10.