Table 1.

The maximum concentrations of PM10 and PM2.5, and mass ratio (in %) PM2.5/PM10 for DFE as observed at Cheongwon, Korea, from January to December 2005

Case	Date	PM10	PM2.5	%-ratio	VSBY
DFE1	29 March	481	32	6.7	10.2
DFE2	7–8 April	332	91	27.4	4.5
DFE3	10–11 April	305	34	11.1	10.5
DFE4	20–21 April	591	62	10.5	9.5
DFE5	29 April	203	75	37.0	10.2
DFE6	6–7 November	604	98	16.2	5.6
DFE7	26 November	225	123	54.7	1.6
Mean (7 episodes, 11 days)		392	74	18.9	7.4