Korea, China, Japan release results of joint study on ultrafine dust


Korea, China, Japan release results of joint study on ultrafine dust


Nov. 22, 2019

Global Korean Post


By Oh Hyun Woo and Kim Minji

The results of a joint study conducted by Korea, China and Japan on the source-receptor relationship and influence of PM 2.5 (ultrafine particles) in the three countries have been released.

The Korea-based National Institute of Environmental Research on Nov. 20 announced a summary report on the results of a research project for long-range transboundary air pollutants in Northeast Asia.

Under Korea’s lead, the joint project launched in 1996 had scientists from the three countries from 2000 study air pollutants including sulfur and nitrogen oxide and PM10 and PM2.5 in stages. The project has completed four stages and the fifth will be done by 2022.

Experts from each country studied domestic and overseas factors behind the pollutants based on the annual average concentrations in 2017 in six cities in China (Beijing, Tianjin, Shanghai, Qingdao, Shenyang and Dalian), three in Korea (Seoul, Daejeon and Busan) and three in Japan (Tokyo, Osaka and Fukuoka).

The report said Korea’s concentration of PM10 showed a steady decline from 2015, and thanks to stronger government policy toward ultrafine dust, the annual average concentration of PM2.5 last year declined 12% from that in 2015.


The sources of Korea’s PM2.5 level were 51.2% from within the nation, 32.1% from China and 1.5% from Japan.

The annual average of PM2.5 from within a country in 2017 was 51% for Korea, 91% for China and 55% for Japan.

The researchers said the study was the first to examine and release the results of research based on the three countries’ recent data on ultrafine dust concentration. They also stressed the importance of joint research to further measure specific pollutants, improve models and ensure accuracy in measuring concentration.