Odor managements were divided from air pollution prevention law because of sensory, temporary, partial, and distributive characteristics. Therefore, odor prevention law and odor analysis method were published for malodor management in Feb. 2004, and Feb. 2005, respectively. In this study, we considered problems of odor prevention law and odor analysis method according to their enforcement, and then we suggested an alternative idea. In the odor prevention law, we thought over odor emission point, application of emission standard, and requirement of odor analysis organization. And also, we considered odor analysis methods such as sampling time, judgment procedure of dilution ratio values of the threshold limit for complex odor, field blank for aldehydes analysis, display of valid figure.

This study was conducted to evaluate the dilution accuracy of the dynamic olfactometer made in Republic of Korea and analyze the correlation of odor levels from the olfactometry method and Liquid Chromatography/Mass Spectrometry (LC/MS). The evaluation of dilution accuracy using CH₄ standard gas for the dynamic olfactometer at lower dilution ratios of 3, 10, 30, 100 and 300, and at higher dilution ratios of 100, 300, 1000, 3000 and 10000 showed the relative errors of 1.48~3.40% and 2.06~4.76% respectively showing a good dilution accuracy. Twenty odor samples from the stacks of odor-monitoring factories in the industrial complex located at the western coastal area of ROK were analyzed with the dynamic olfactometer for complex odor and LC/MS for five types of aldehydes, and a very weak correlation of R² = 0.1276 between OU(Odor Unit) from the olfactometer data and SOQ (Summation of Odor Quotient) from LCjMS data was obtained. Because of the complexity of the odor composition, using concentration of single or group of gases to represent odor level has not been proved to fully estimate the presence or level of odors. Therefore, the dynamic olfactometry which has a good dilution accuracy and a standardized odor evaluation system is considered as a very resonable method to assess complex odor.

We investigated dilution ratio values of the threshold limit (DRVTL) and 12 odorous compounds from a number of emission points (stack and process) and boundary areas of 10 chemical industries in the Ban-Woll and Shi-Wha Industrial Complex in Gyeonggi Province. The results of our study suggest that differences in odor emission concentrations are caused by such as factors as : suitability and operational conditions of prevention equipment, suitability hood of process and exhaust ventilation system, differences of raw materials of chemical industry. It was found that trimethylamine and hydrogen sulfide recorded the highest contribution from two types of emission points (stack and process), respectively. Show some actual concentration values here, hydrogen sulfide recorded its maximum values from leather industry, while trimethylamine for hexamine production industry. On the other hand, the results of dimethyl sulfide, dimethyl disulfide and methyl mercaptan were not useful, as their concentrations were not significantly high enough to judge from such respect. In the view-point of dilution ratio values of the threshold limit, the average emission ratio of stack and process from 10 chemical industries was 57, 43%, respectively. Therefore, it is important that the odor emission value from process and stack have to minimize and regulate for management of industrial odor.