The South Korean government says most of the fine dust particles choking Seoul originate from overseas.
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.
Over the last five years, around 30 percent of fine dust came from China.
Up to 45 percent of ultra-fine dust is produced in South Korea, with Gyeongsangnam-do Province generating the most.
The officials also discussed new technologies aimed at protecting the public against the dust.