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The purposes of this study were to improve the standard analytical method for decabromodiphenyl ether (deca-DBE) and investigate the concentrations of brominated flame retardants such as the hexabromocyclododecanes (HBCDs) and deca-DBE in water (n=8) and ambient air (n=6). The HBCDs were pretreated via hydrophilic-lipophilic balanced solid-phase extraction and analyzed by LC/MS/MS, affording limit of quantification (LOQ) values of 0.22~0.44 ng/L and 0.24~0.85 pg/m3 in water and air, respectively. In air, the concentration of HBCDs, among which the γ-isomer was the most prominent, ranged from <LOQ to 505.35 pg/ m3 as the median value. In contrast, HBCDs were not observed below the detection limit in water at any sampling site. Deca-BDE was extracted by liquid-liquid extraction of the water samples or Soxhlet extraction of the air samples, and subsequently analyzed by HRGC/HRMS after purification through a multi-layer silica gel column. The LOQs for deca-BDE were 1.32 ng/L and 2.5 pg/m3 in water and air, respectively, and its concentrations ranged from <LOQ to 10.3 ng/L in water and 21.4 to 87.1 pg/m3 (median) in air. Through this study, we found that the levels of HBCDs and deca-BDE in air and water in Korea are lower or similar to those of other countries

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