ÀÌ»êÈź¼Ò, ¾Ï¸ð´Ï¾Æ, Áú¼Ò»êȹ°, ¾ËÄÝ·ù, º¥Á¨°¡½º¸¦ °ËÃâÇÏ´Â ¾Æ³¯·Î±×½Ä ¼¾¼ÀÔ´Ï´Ù. ¾ËÄڿÿ¡´Â ¾àÇÏ°Ô ¹ÝÀÀÇÕ´Ï´Ù.
»ç¿ë ´ë±â½Ã°£ÀÌ ÇÊ¿äÇÏ°í, Ãâ·ÂµÇ´Â °ªÀº PPM°ú ºñ·ÊÇÏÁö¸¸, ±âÁØ°ªÀ» Á¤ÇØ¾ß ÇÕ´Ï´Ù.