Seoul issues ultrafine dust advisory, asks people to stay indoors
Dec 21, 2013
South Korea's capital city has issued its third ultrafine dust advisory this month on Saturday, advising people to stay indoors. The measure was taken after Seoul's atmospheric concentration levels of "particulate matter-2.5" pollutants stood at 69 micrograms per cubic meter as of 10 a.m. after hitting 62 micrograms in 8 a.m. Seoul issues an advisory if the pollutant levels stay above the 60 micrograms per cubic meter for more than two consecutive hours.The alert is lifted after concentratio