Ammonium nitrate, ammonium sulfate, earth crustal material and organic matter are what make up the thick blanket of ultrafine dust that sometimes swamps the skies of Seoul and Beijing, …according to joint air quality research by South Korea and China that has been conducted in the Chinese capital since 2017.
The percentage of ammonium nitrate, …associated with emissions from cars, was similar between Seoul and Beijing.
The ratio of ammonium sulfate in Beijing, …associated with petroleum and coal burning, …was about half that of Seoul.
As of 2017, … the proportion of ammonium nitrate rose by more than ten percent in Beijing and 22 percent in Seoul, …attributed to an increase in the number of cars and other vehicles on the roads.
According to the National Institute of Environmental Research, the ratio of ammonium compounds in Beijing dropped due to the Chinese government's energy restructuring policy to reduce China's use of fossil fuels.
However, the high use of fossil fuels in the winter increased the ratio of organic materials in ultrafine dust.
The researchers say the make up of ultrafine dust is similar around the world, but the composition ratio varies according to lifestyle and environment.
They added this particular study was carried out to determine the causes of ultrafine dust in both cities in order to establish anti-fine dust policies.
Park Se-young, Arirang News.