The South Korean government says most of the fine dust particles choking Seoul originate from overseas.<br />The research, released on Wednesday, found up to 80 percent of ultra-fine dust comes from other countries,... with most blowing in between November and April.<br />Over the last five years,... around 30 percent of fine dust came from China.<br />Up to 45 percent of ultra-fine dust is produced in South Korea,... with Gyeongsangnam-do Province generating the most.<br />The officials also discussed new technologies aimed at protecting the public against the dust. <br />
