• Title/Summary/Keyword: ozone standard

Search Result 96, Processing Time 0.025 seconds

Surface Ozone in The Major Cities of Korea : Trends, Diurnal and Seasonal Variations, and Horizontal Distributions (한반도 주요 대도시지역의 지표오존 특성 : 추세, 일변화, 월변화, 수평분포)

  • 오인보;김유근
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.18 no.4
    • /
    • pp.253-264
    • /
    • 2002
  • Surface ozone concentrations measured at 40 monitoring sites in three major cities (Seoul, Busan, and Daegu) of Korea during 1993~2000 were analyzed to understand the characteristics of temporal and spatial distributions. Trends were analyzed for annual mean, 95th percentiles of daily 8-hour maximum and days exceeding 8-h ozone standard of 60 ppb. Three indicators exhibited increasing trends (+0.75 ppb yr$^{-1}$ , +2.20 ppb yr$_{-1}$ , and +5.35 days yr$_{-1}$ on average) throughout the study period at all cities. Diurnal and seasonal variations were the largest in Seoul followed by Daegue and Busan, due to the high photochemical production and titration of ozone (Seoul), strong wind and constant supply of background ozone from the ocean (Busan). In the urban centers and industrial areas at all cities, scavenging of ozone by NO reduces the daily 8-hour maximum ozone by 10 ppb on average. High concentrations of ozone have frequently occurred in downwind eastern (Seoul and Daegu) or northern (Busan) sides of the territory. In particular, the coastal area of Busan had relatively high ozone level due to the local sea land breeze circulation. The results indicated that the temporal and spatial variations of ozone concentration were non -uniform and were closely related to the local environments; emission levels, climates, and geographic locations.

Determination of Ozone Tolerance on Environmental Tree Species Using Standard Index (표준화 지수를 이용한 환경수목의 오존 내성 결정)

  • Han, Sim-Hee;Kim, Du-Hyun
    • Korean Journal of Agricultural and Forest Meteorology
    • /
    • v.11 no.1
    • /
    • pp.3-12
    • /
    • 2009
  • Ozone tolerance of tree species was determined by standard index of physiological damages and biochemical defense responses under short-term ozone exposure. At the end of 150ppb $O_3$ fumigation, photosynthetic characteristics and antioxidative enzyme activities were analyzed in the leaves of five species(Koelreuteria paniculata, Firmiana simplex, Styrax japonica, Fraxinus rhynchophylla, Viburnum sargentii). Injury index was determined by the effect of ozone on photosynthetic parameters and malondialdehyde(MDA) content, and tolerance index was calculated using the rate of increase in superoxide dismutase(SOD), ascorbate-peroxidase(APX), glutathione reductase(GR) and catalase(CAT) activities. Apparent quantum yield(AQY), carboxylation efficiency(Ce) and photo-respiration rate(PR) decreased in the leaves of five species with increasing ozone exposure time. These parameters were considered as an appropriate indicator for stress evaluation. Antioxidative enzyme activities showed various results depending on the tree species, exposure time, and enzyme types. SOD activity of K. paniculata increased with ozone exposure time, and that of F. rhynchophylla increased only after 6 hours of ozone exposure. CAT activity of $O_3$-exposed F. simplex was lower than the control. Based on standard index, ozone tolerance ability of five species was determined as two tolerant species(F. rhynchophylla > K. paniculata) and three sensitive species(S. japonica > F. simplex > V. sargentii).

Land Based Test of Ballast Water Treatment System by Ozonation

  • Park, Sung-Jin;Yoon, Seung-Je;Kim, In-Soo
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.34 no.3
    • /
    • pp.383-390
    • /
    • 2010
  • This study is currently giving priority to developing the ship's ballast water treatment system using ozone (Ozone BWTS). The Ozone BWTS was tested in a full scale land-based mobile barge to evaluate performance according to the IMO G8 Guidelines. Test cycles using the mobile-barge were conducted in seawater and brackish water in the vicinity of the Port of Busan and Nakdong River, Republic of Korea. All tests were conducted according to the requirements of the G8 Guidelines. Test results show that the Ozone BWTS meets the Ballast Water Performance Standard contained in Regulation D-2 of the IMO Ballast Water Management Convention, as well as all of the operational, safety, and environmental testing requirements of the G8 Guidelines, as required for type approval of IMO. The study results show that the Ozone BWTS is capable of meeting the Ballast Water Performance Standard under Regulation D-2 of the International Convention for the Control and Management of Ships’ Ballast Water and Sediments, and also the more stringent standards being proposed under US legislation.

Characteristics on the Variations of the Total Ozone over Pohang (1994-2004) using the Brewer Spectrophotometer and TOMS

  • Hong Gi-Man;Choi Byoung-Cheol;Goo Tae-Young;Lim Jae-Chul;Lim Byung-Sook;Baek Moon-Hee
    • Proceedings of the KSRS Conference
    • /
    • 2005.10a
    • /
    • pp.388-391
    • /
    • 2005
  • The characteristics of the total ozone variations measured by the ground-based Brewer Ozone Spectrophotometer and the Total Ozone Mapping Spectrometer (TOMS) over Pohang are statistically examined from January 1994 to December 2004. First of all, in the correlation analysis of the total ozone measured from the Brewer Ozone Spectrophotometer and the TOMS, the correlation coefficient was 0.88 and the used data were 2190. The annual mean value of the total ozone is 311 DU with the standard deviation of 13 DU. The maximum and the minimum value were found in March (343 DU) and in September (282 DU), respectively. It was also revealed that the longest seasonal variation is in Spring (341 DU) and the smallest is in Autumn (283 DU). The time series data of the total ozone indicates that the annual variation is significant and the variations for three months and six months are relatively weak. Finally, the annual mean total ozones in Pohang (Brewer), Seoul (Brewer) and Busan (TOMS) are 312 DU, 324 DU and 304 DU, respectively.

  • PDF

Indication of Photochemical Air Pollution in the Greater Seoul Area, 1990 to 1995 (1990~1995 서울ㆍ수도권 지역의 광화학 오염현상)

  • 김영성
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.13 no.1
    • /
    • pp.41-49
    • /
    • 1997
  • Status of photochemical air pollution in the Greater Seoul Area (GSA) between 1990 and 1995 was assessed in terms of frequency distributions, number of days exceeding standards, average concentration and meteorological effects. In Seoul compared with other areas in Korea, daily maximum concentration was higher but average concentration was not so high due to lower daily minimum from April to October. The top 5th percentile was high especially in summer season. Average number of days exceeding 100 ppb at monitoring stations in GSA was highest in 1994, the hottest year, but it was only 4 days a year. Mean meteorological pattern of high ozone days could be summarized as low wind speeds, high temperatures, strong solar radiation, and low precipitation. Westerlies were more frequent on high ozone days and at Pangi station located in the eastside of GSA, both number of high ozone days and average concentration were high. Effect of precursor transport on the rise of ozone concentration was, however, not consistently important on the whole in GSA.

  • PDF

Indirect Assessment on Helth affect of Air Pollutants Generated by Photo-Chemical Reaction (광화학반응에 의해 생성된 대기오염물질이 인체에 미치는 영향의 간접평가 (우리 나라 대기오존농도 추이와 문헌고찰을 중심으로))

  • 신찬기;김대선
    • Journal of environmental and Sanitary engineering
    • /
    • v.9 no.2
    • /
    • pp.32-40
    • /
    • 1994
  • The concentration of ozone in 5 major cities in Korea( Seoul, Pusan, Taegu, Kwangjoo, Incheon ) has been shown increasing trend after 1984, while decreasing trend in Hsan. According to the data from 12 monitoring stations in 9 cities of metropolitan area from January 1994 to August 1994, ozone concentration exceeded short term standard 99 times and 87%(861imes) of those was occurred during July and Augusta while the maximum ozone concentration was appeared mainly between 14: 00 and 17: 00 daily. As the result of epidemiological survey, main substances which irritate eyes were identified to be PAN and formaldehyde rather than ozone while ozone was identified to be reachable to deep part of respiratory system main target organ of ozone.

  • PDF

Study on the Assessment of Air Quality Before and After Action Plan of Atmospheric Environment Improvement Establish at Gimhae, Gyeongnam Province (경남 김해지역의 대기환경개선 실천계획 수립 전후의 대기질 평가에 관한 연구)

  • Park, Jong-Kil;Jung, Woo-Sik;Kim, Seok-Cheol;Kim, Eun-Byul
    • Journal of Environmental Science International
    • /
    • v.17 no.10
    • /
    • pp.1111-1120
    • /
    • 2008
  • In order to study the degree of improved air quality as an outcome of the action plan of Atmospheric Environment Improvement in Gimhae, Gyeongnam Province, we investigated the status and trends of air pollutant before and after the plan. Nitrogen dioxide and ozone, both classified as hazardous substances, were closely monitored with particular attention. The level of sulfur dioxide, nitrogen dioxide, fine particles and ozone (but for carbon monoxide) was decreased after the plan was implemented. The number of days on which ozone exceeded the National Ambient Air Quality Standard has decreased, but the level was still often exceeded. The level of nitrogen dioxide did not surpass until the 2006 standard, but when the revised 2007 standard was implemented, it exceeded 80% of some standards. The yearly level of ozone has decreased since the plan was introduced. The concentration of nitrogen dioxide, however, has reduced in high order area while increased in low order area.

Development of Ozone Plasma Sterilizer with Air Circulation Device (공기순환장치 적용 오존 플라즈마 살균장치 개발)

  • An, June;Chun, Young-Nam
    • Journal of Korean Society of Occupational and Environmental Hygiene
    • /
    • v.31 no.1
    • /
    • pp.105-110
    • /
    • 2021
  • Objectives: The purpose of this study was to develop a new sterilization plasma device that would be proficient at sterilizing and removing pathogenic bacteria and viruses, and applicable to air purification systems. Methods: In order to understand the performance characteristics, the discharge characteristics of a packed bed DBD reactor and the ozone reduction characteristics of an ozone filter installed at the outlet of the reactor were investigated. Results: The novel packed-bed DBD reactor was proposed, and it was confirmed that the plasma discharge was uniformly and stably discharged throughout the entire layer, and sufficient ozone was generated for sterilization. The ozone filter was tested for three methods: adsorption, adsorption-decomposition, and catalytic decomposition. When the filter thickness was 30 mm, the ozone concentrations were 0.03 ppm, 0.01 ppm, and 0.21 ppm, respectively. The adsorption and adsorption-decomposition methods satisfied the EPA standard of less than 0.05ppm, but the catalytic decomposition method did not. Conclusions: It was confirmed that the adsorption-decomposition method has relatively excellent ozone filter performance and can provide the best ozone filter.

A study on sanitary emprical for specific property removal of pollution material inter a water tank by ozone (오존을 이용한 수조속의 오염물질 제거특성에 관한 실험적 연구)

  • Lee, Kwan-young;Ahn, Seoung-Seop;Park, Sang-hyun
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.5 no.1
    • /
    • pp.75-80
    • /
    • 2002
  • In this study, the initial number of bacteria before ozone sterilizing shows 290 per $1m{\ell}$ in RUN 1 and RUN 2 equally, but the removal rate shows more than 50% in RUN 1, and 100% in RUN 2 respectively when ozone injection amount is $0.28mg/{\ell}$. It is regarded as a satisfactory result that E-coli concentration without ozone contact is 890, rapid removal effect of E-coli is observed in $0.28mg/{\ell}$ of ozone, and E-coli is removed perfectly in $0.84mg/{\ell}$ of ozone. It is thought that an excellent efficiency is obtained for vibrio alginolyticus because the initial number of bacteria before ozone contact is positive, but it is altered to negative after ozone contact. CODcr shows the tendency which is somewhat reduced as the ozone injection is increased, but the general effect is appeared not so much, and it is thought that the tendency is caused by the reason that sea water contains much salt which is estimated as a component of CODcr, therefore it is regarded that ozone contact has not an important effect on salinity. It is thought that the frequency of changing salt water in the fish preserve of a sliced raw fish restaurant can be reduced to under the standard because NTU of 7 days after sea water injection is 0.70 in the experiment of turbidity, hut more than 50% of turbidity removal efficiency is appeared at $0.28mg/{\ell}$ of ozone injection, and it shows 70% at $0.84mg/{\ell}$ of ozone injection in RUN 1 and RUN 2 commonly.

  • PDF

Measutements of the ground-level ozone in a rural area of Chongwon, Korea (충북 청원군에서 관측된 지표면 부근의 오존)

  • 윤마병;정용승
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.11 no.1
    • /
    • pp.85-93
    • /
    • 1995
  • Measurements of ground level ozone concentrations were made in a rural area of Chongwon (Choongbook Province) from June 1993 to July 1994. High values frequently exceeding 100 ppb (ambient air qualyty standard of Korea) were recorded. High ozone concentrations in the boundary layer were primarily correlated with the several meteorological parameters in warm seasons: pressure, radiation, temperature, precipitation and wind velocity. The annual average concentration of ozone at Chongwon was 17ppb, and this value was relatively higher than those for other cities in Korea. O$\_$3/ concentrations were observed to increase when the ridge of a surface anticyclone was passing over the region, and maximum values(.geq.100 ppb) were observed on the rear sides of high pressure centers and in the warm sectors of cyclones(well head of cold fronts). The ozone concentrations had a negative correlation with the concentration of primary pollutants(e.g., total hydrocarbons).

  • PDF