Characteristics of Fog and Mist Observed in the Rural Area of Chongju and Chongwon

청주-청원 지역에서 관측한 안개와 박무의 특성 연구

  • 윤마병 (한.중 대기과학연구센터) ;
  • 정용승 (한.중 대기과학연구센터)
  • Published : 1996.03.01


Daily measutements of visibility on 09 LST have been made at a rural site in Chong-won, Chong-book since 1991 to find out a possible influence of emissions of anthropogenic pollutants and water vapout in urban and rural environments. Daily visibility data collected over four-year period were compared with the available visibility and air quality data obtainde from other stations. Detailed examinations of our data showed that the frequency of fog occurrence (visibility .leq. 1 km) at a rural site (KNUE) was at least three times higher (77 days per year) than the frequency of fog both in Chong-ju city (19 days) and at the Air Force Base(AFB) in the rural area. We interpret that the higher frequency of fog at KNUE was due to abundant water vapour in the Mieho River (upstream of the Keum River) area. In Chong-ju city, fog usually continued for a relatively long duration, while it dissipated simewhat faster in the rural environment due to higher solar radiation in the countryside area. The number of misty (.leg. 6 km) days (including foggy days) at KNUE were 235 days as compared with 135 days at the AFB and 67 days in Chong-ju city. In turn the number of days with low visibility (less than 6 km) at KNUE was about 64% per year. Since the moisture alone in a calm morning does not produce a visibility impairment, there must had abundant condensation nuclei including anthropogenic air pollutants. Air pollution was examined, for instance, average values of TSP for November and December 1993 were 115 and$^{3}$, respectively. We conclude that the above mentioned environmental conditions with moisture are favourable for the formation of fog and mist in the rural sampling site at KNUE. Additionally, we found at least 10 days of acid fog at KNUE in September 1994 alone. Measured pH values in the acid for water were in the range of 4.36 .sim. 5.01 with the mean value of 4.51 Our observations suggested that strikingly acid fog do occur occasionally even in the rural environment.


Fog;Mist;Visibility impairment;Rural anthropogenic pollutants;Condensation nuclei;Acid fog


  1. 한국기상학회지 v.6 한국 안개 기후구 설정에 관하여 김성삼;이내영
  2. 한국환경과학회지 v.2 공단지역에서 대기중 총부유분진의 입자 크기 분포와 화학적 성분에 관한 분석과 연구 박흥재;이성욱;박원우
  3. 한국대기보전학회지 v.8 충북 청원군의 안개, 이슬, 서리의 산성도 연구 정용승;김태군
  4. 한국환경과학회지 v.3 청주 지방의 시정 변화에 관한 연구 이성범;정용승
  5. Atmospheric Pollution its origin and prevention Meetham,A.R.
  6. 한국대기보전학회지 v.9 no.1 서울의 대기오염과 시정감소 최정숙;정용승
  7. 한국기후표 v.Ⅱ 기상청
  8. 한국기상학회지 v.7 경부 고속도로상의 안개 구역에서의 안개발생에 관한 연구 민경덕
  9. Atmospheric Physics Fleagle R.G.