ROUGH CUT (NO REPORTER NARRATION)
Smog blowing from central China covered the South Korean capital on Wednesday (December 4).
The National Institute of Environmental Research said Seoul's daily average of the density of airborne particles less than 10 micrometers, also called PM10 concentrations, reached 81-120 micrograms on Tuesday (December 3).
Residents wore face masks and expressed concern about pollution.
The smog contains toxic heavy metals such as lead, cadmium and arsenic, Seoul's metropolitan government said.
Local media said autumn westerly winds are expected to bring elevated levels of particulate matter and pollution to South Korean cities, which might get worse when Chinese power plants start burning massive amounts of coal for heating during the winter months.
