Abstract

During the period from June 1st 1971 to November 30th 1971, studies on air polluton were made in Kwangju city. The city was divided into 6 areas : the downtown ares, the simi-downtown area, the heavy traffic area, the commercial area, the residential area, the park area, 13 surveying sites were selected each representing the characteristics of the area. The Measurement methods which were used are described below. Sulfur oxides were measured by PbO2 cylinder method, sulfur dioxides (SO2) and carbon monoxide (CO) by the MSA & Kitakwa detector, dustfall by the Deposit gauge method, and the noise levels by the Kanomax sound level meter. The results obtained are as follows : 1. The mean value of sulfur oxides in Kwangju city was 1.16 mg SO3/day/100cm2 PbO2, ranging from 0.45mg SO3/day/100cm2 PbO2 to 3.10mg SO3/day/100cm2 PbO2. 2. The mean value of sulfur oxides according to its specific area in the city were 1.45mg SO3/day/100cm2 PbO2 in heavy traffic area, 1.36 in downtown area, 1.23 in semi-downtown area, 1.11 in commercial area, 0.96 in residential area, and 1.07 in park area, respectively. 3. The average concentration of sulfur dioxide was 0.063 ppm from 2 to 5 P.M in Kwangju city. 4. The average concentration of sulfur dioxides according to its specific area, from 2 to 5 P.M, in the city were 0.084 ppm in heavy traffic area & downtown area, 0.067 in commercial area, 0.053 in semi-downtown area, 0.052 in residential area, and 0.036 in park area. 5. The average concentration of carbon monoxide was 22.3 ppm from 2 to 5 P.M in Kwangju city. 6. The average concentration of carbon monoxide according to its specific area, from 2 to 5 P.M, in the city were 27.0ppm in downtown traffic area, 26.3 in semi-downtown area, 23.0 in heavy traffic area, 21.7 in commercial area, 20.0 in residential area, and 17.6 in park area. 7. The mean value of dustfall in Kwangju city was 29.28 ton/Km2/month, ranging from 9.85 ton/Km2/month to 66.34 ton/Km2/month. 8. The mean values of dustfall according to its specific area in the city were 50.37 ton/Km2/month in semi-downtown area, 42.76 in heavy traffic area, 34.67 in downtown area, 17.77 in commercial area, 14.40 in park area, and 14.76 .in residential area. 9. The mean value of the soluble dust in Kwangju city was 10.23 ton/Km2/month and that of the insoluble dust was 19.05 ton/Km2/month. 10. The mean values of noise level in Kwangju city was 62 phon, ranging from 37phon to 88 phon. 11. The mean values of noise level according to its specific area in the city were 76 phon in heavy traffic area, 67 in semi-downtown area, 64 in downtown area, 59 in commercial area, 52 in part area, and 50 in residential area.