Fine dust particles, which have recently shrouded the whole nation in a prolonged period, have engaged much more attention to build and manage healthy and clean ambient air quality than ever before. Against this background, it is time for Busan Metropolitan City(BMC) to review and map out the measures to prevent air pollution and improve air quality, which are one of the mandatory requirements for citizens to lead a healthy and pleasant life. While Comprehensive Air-quality Index(CAI) has been developed and utilized as a measure of describing the outdoor air quality based on the data of air pollutant concentrations, the index still needs to be actively utilized. To tackle such issues, the study has aimed to: analyse CAI through monitoring air pollution in Busan area; explore air-quality features in the region based on public opinion; and figure out the management strategy for air environment. For the purpose, the study has covered the following items: review of CAI; time-series analysis of air-quality features in the city; analysis of air-quality features using CAI; opinion polls on air environment; and management strategy for controlling the air environment in the area. For the evaluation of air quality in Busan area, the study has examined and assessed the original data obtained over the 5 year period - 2011 to 2015 - from 19 monitoring stations, which have opened for average air-quality concentrations in urban area by BMC, as well as the information on 2013 air-pollutant emissions presented by the National Institute of Environmental Research. The finding shows that, first, metal manufacture is the major emitter of air pollutant and the fifth-class of business places account for 52.9 percent in air pollutant emissions. Secondly, non-road mobile pollutant sources are the top air-pollutant emitter with 37.0 percent, followed by motor vehicle exhaust with 26.4 percent. Finally, air pollutant sources and emissions are distributed along main street, adjoining zones to ports, and factory parks, spatially. To incorporate public awareness and opinion on air environment with the management strategy, the study has conducted an opinion poll in the region. The survey results indicate that respondents are having strong interests in the air environment of the city and their residential areas. They also take the level of contamination in those regions seriously, which leads to low satisfaction of air quality. Furthermore, the poll shows that large numbers of respondents think the air environment in their area has deteriorated in recent years compared to the 5 years ago, and they predict little progress in the same period as well. Through the exploration of air quality, the study has drawn up some tasks: preventong the emission of air contaminants - mainly nitrogen oxide, and fine dust particles; preparing detailed measures against frequently occurring highly-concentrated fine dust; diversifying standard references for evaluation of air quality; coming up with awareness-raising tools based on public opinion polls; formulating a trial application of air quality indicators having common ground with the citizens; and raising the profile of air quality information system. For the examination of air-quality features in the region with CAI, the study has scrutinized the influencing relationship among determinant factors by means of statistical data analysis, which has factored in local circumstances ― landuse characteristics, traffic volume, meteorological factors, etc. ― and public view on the air environment. The determinant factors for "good" level of CAI have positive relationship with the advance of the air environment, lower proportion of road and the less concentrations of air pollutants since 2011. The factors are also directly proportional to the fact that the residents consider the air quality in their region harmful. Amid the factors, fine-dust(PM10) concentrations have the biggest portion, followed by ozone(O₃), and nitrogen dioxide(NO₂). The consideration has been interpreted to have high explanatory power of 87.2 percent. Meanwhile, the determinant factors for "more than bad" level of CAI do the same as: people think the air environment in their region harmful; there are many industrial complexes; air pollutants have high concentrations with large volume of nitrogen dioxide emission; and the wind is high. Nitrogen oxide(NOx) emissions have topped the list, followed by ultra-fine particles(PM2.5) emissions, fine-dust(PM10) concentrations, and ultra-fine particles(PM2.5) concentrations. It also has very high explanatory power with 95.7 percent. On the basis of these findings, the study has confirmed the possibility of making and pushing forward of air quality measures, which will be kinds of qualitative indices, and be effectively echoed by the residents. The study has also verified that it is necessary and vital to prepare special measures by regions and zones, which consider local circumstances such as landuse. Grounded on the assessment of air quality in Busan region, opinion poll on the air environment, and analysis of air quality features using CAI, the study has mapped out BMC's management plans for the air environment. And so, the study has suggested detailed strategies originated from 3 basic measures ― policy direction shift of air environment management, promotion of regionallyspecialized, niche, and customized projects, and building a governance for air environment improvement. For policy direction shift of air environment management, the study has recommended revision of "BMC implementation plan for air environment improvement," development of air environment management indicators echoed by the citizens, a rapid set-up of standard references for ultra fine particles(PM2.5) by regions, and enhancement of coordinate response from the metro local-governments and relevant organizations. Regarding the promotion of regionally-specialized, niche, and customized projects, the study has suggested to establish the inventory of air pollutant emissions, come up with measures by sectors, seasons, and regions, install motor vehicles with both fine-dust and NOx reduction devices, support the replacement and distribution of eco-friendly boilers, set up information system of street cleaning, and introduce “Clean Road System”. Lastly, for the building a governance for air environment improvement, the study has proposed a comprehensive package that includes a city-wide campaigns for air environment, expansion of service to communicate air environment information to the public, introduction of visiting lecture program on the air environment policies, activation of information system for air environment, “1 company-1 street management program”, and “road clean day”.