Carbon dioxide levels in the atmosphere are steadily increasing on the Korean Peninsula. 
 
The Korea Meteorological Administration says the average CO2 concentration on the peninsula recorded 402-point-four parts per million (ppm) last year. The level has risen for the past 15 years since data began to be recorded in 1999.
 
Over the past 15 years, CO2 grew two-point-one ppm annually on average, similar to the global average of two ppm.
 
While CO2 accounts for the largest percentage among greenhouse gases in the air, another greenhouse gas sulfur hexafluoride (SF6) has also increased by point-four parts per trillion (ppt) to eight-point-six ppt last year.
 
On the other hand, levels of chlorofluorocarbons (CFC) are found to be decreasing. CFCs were included in the 1989 Montreal Protocol on Substances that Deplete the Ozone Layer.
 
In particular, CFC-11 fell more than seven ppt last year to 236 ppt to mark a decline for the 15th year.
 
CFC-113 and CFC-12 levels also edged down last year.