The Seoul Metropolitan Government announced that the average fine dust level throughout spring 2012 in Seoul was 52㎍/㎥, the lowest since 1995, when records began, partly because of a reduction in the quantity of yellow dust this spring.
The air in Seoul has been getting cleaner by the day in recent years. The city government has arranged for the N Seoul Tower at Mt. Nam to be illuminated in blue if the day’s air quality is 45㎍/㎥ or less to enable Seoul citizens to check the air quality quickly and easily. The lighting hours of the tower are from sunset to 11 p.m. (10 p.m. in winter). The threshold fine dust level of 45㎍/㎥ represents the maximum level experienced in Jeju, the cleanest region in Korea.
This spring, the N Seoul Tower was lit up in blue for 52 days, showing a four-day increase over 2011.