A man wearing a mask rides a bicycle along the Han river in Seoul, South Korea, Wednesday, March 6, 2019. South Korean President Moon Jae-in has proposed a joint project with China to use artificial rain to clean the air in Seoul, where an acute increase in pollution has caused alarm.

Visitors tour at the Gyeongbok Palace in Seoul, South Korea, Wednesday, March 6, 2019. South Korean President Moon Jae-in has proposed a joint project with China to use artificial rain to clean the air in Seoul, where an acute increase in pollution has caused alarm.

People wear masks to protect from air pollution at a bus station in Seoul, South Korea, Wednesday, March 6, 2019. South Korean President Moon Jae-in has proposed a joint project with China to use artificial rain to clean the air in Seoul, where an acute increase in pollution has caused alarm.

Women wearing masks to protect from air pollution walk in Seoul, South Korea, Wednesday, March 6, 2019. South Korean President Moon Jae-in has proposed a joint project with China to use artificial rain to clean the air in Seoul, where an acute increase in pollution has caused alarm.

Via AP News