| Popis: |
Environmental studies have been conducted in several major Asian cities to evaluate the influence of pollution on global weather conditions, and the results have been made public. This paper reports the results of SPM(suspended particulate matter)measurements carried out at Vladivostok, Jakarta, and Kaohsiung, where official data are not obtained easily. The author has carried out the measurements using a laser dust monitor, analyzed public meteorological data, and drawn contour maps according to the SPM concentration data. The air environment of Vladivostok and Jakarta has significantly improved since the time of investigation. The decrease in the SPM density can be attributed to the following factors: 1)Introduction of second-hand cars from Japan and the use of exhaust gas control technology in cars. 2)Introduction of new policies limiting exhaust gas emissions and urban traffic. 3)Weather condition on the day of measurement. The data measured at Kaohsiung show that the SPM density is strongly influenced by the measurement time, and not by the measurement place. Moreover, the SPM density at Kaohsiung has been found to change significantly during the day. The SPM concentration is low during the day, but increases from dusk to dawn. The increase in SPM concentration is a serious problem, and the administration should take measures to control the SPM concentration. Because the latest SPM data cannot be obtained easily, it is not possible to discuss city environmental problems in detail. Urban traffic and air pollution have serious implications on the city environment. By using the method explained in this report, visual information on the air contaminant distribution in cities can be obtained instantly, without using large-scale expensive equipment. This information will be useful for designing cities and improving the quality of city life in the future. |
