Most of South Korea this weekend has seen high levels of fine dust pollution in the air.
Today, in every part of the country, except Jeju Island, the dust was at levels considered bad or very bad.
And on Monday, it's going to get worse.
It'll go up to very bad in all regions except the southernmost provices and cities, such as Busan, the Gyeongsang-do provinces and Jeollanam-do Province.
The pollution has triggered emergency measures in Seoul, Incheon and much of Gyeonggi-do Province.
Thermal power plants are limited to 80 percent of capacity, and more than 100 businesses that emit air pollutants will have to cut their operating hours.
But there are currently no restrictions on vehicles.
The ministry says the measures will continue into Monday.