(ECNS) -- The Ministry of Environmental Protection announced on Thursday that it is "unscientific" to say that smog in north China was caused by radiation, China Youth Daily reports.
The ministry said it had organized nuclear security experts to do research on the cause of the smog and found there is no direct relation to radiation.
Experts believe the smog is formed mainly by a mixture of pollutants in the atmosphere, and consists of fine airborne particles.
Sources of these pollutants are mainly caused by gasoline and diesel-run vehicles, industrial plants and related processes, geographical conditions as well as weather and climate status.
In the process of burning coal, more than 80 percent of residual uranium and thorium remains in the slag, as well as after dust removal and filtration, while only 1 to 2 percent of raw coal is discharged with smoke, according to experts.
In addition, statistics over the past 10 years shows that there is no significant change in the level of radiation, which is stable in China, it was added.
