Hourly concentrations of

,

and

, were investigated at Gangneung city in the Korean east coast on 0000LST October 26~1800LST October 29, 2003. Before the intrusion of Yellow dust from Gobi Desert,

(

,

) concentration was generally low, more or less than 20 (10, 5)

, and higher PM concentration was found at 0900LST at the beginning time of office hour and their maximum ones at 1700LST around its ending time. As correlation coefficient of

and

(

and

, and

and

) was very high with 0.90(0.99, 0.84), and fractional ratios of
/PM_{2.5}((PM_{2.5}-PM_1)/PM_1)$})
were 1.37~3.39(0.23~0.54), respectively. It implied that local

concentration could be greatly affected by particulate matters of sizes larger than

, and

concentration could be by particulate matters of sizes smaller than

. During the dust intrusion, maximum concentration of

(

,

) reached 154.57(93.19, 76.05)

with 3.8(3.4, 14.1) times higher concentration than before the dust intrusion. As correlation coefficient of

and

(vice verse,

,

) was almost perfect high with 0.98(1.00, 0.97) and fractional ratios of
/PM_{2.5}((PM_{2.5}-PM_1)/PM_1)$})
were 0.48~1.25(0.16~0.37), local

concentration could be major affected by particulates smaller than both

and

(fine particulate), opposite to ones before the dust intrusion. After the ending of dust intrusion, as its coefficient of 0.23(0.81, - 0.36) was very low, except the case of

and

and
/PM_{2.5}((PM_{2.5}-PM_1)/PM_1)$})
were 1.13~1.91(0.29~1.90), concentrations of coarse particulates larger than

greatly contributed to

concentration, again. For a whole period, as the correlation coefficients of

,

,

were very high with 0.94, 1.00 and 0.92, reliable regression equations among PM concentrations were suggested.