Spatio-Temporal Variations of Daily Average Concentration of NO<SUB>2</SUB> in an Area with Trunk Roads
スポンサーリンク
概要
- 論文の詳細を見る
From the viewpoint of evaluating the inhabitants' risk by air pollution, it is one of the important purposes imposed on air pollution monitoring system to evaluate the degree of air pollution in the living space and population exposure. To clarify the possibility of evaluating the air pollution in the living space by means of monitoring system, the information on the spatio-temporal variation of air pollutant's concentration in the city is essential. In order to evaluate the spatio-temporal variations of NO2 concentration in a residential area with trunk roads, daily average concentration was measured by using passive samplers in an area of 3 km in east and west and 4 km in north and sourth around Setagaya Ward Office of Tokyo. The survey was carried out during a period of 5 days in March 1989. Sampling sites were located in two kinds: sites at the grid points with about 1 km intervals (3×4=12 sites) and sites between the Ward Office and the No.7 loop road (15 sites). The latter sites were grouped according to the distances from the No.7 loop road. Analysis of variance of a two way classification with main effects for days and sites confirmed the previous result that the variances due to days were extremely large. Further analyses showed the following results:(1) the variations of 1 km scale revealed variances between sampling sites and those due to day/site interaction were the same as or smaller than the previous results, (2) the concentration near the No.7 loop reduced much in case some structures exist between road and site, and the concentration decreased with the distance from the road, (3) variance between days within each group did not depend much on the distance of the group of sites from the road in the area within 350 m from road, (4) the variances between sites and day/site interaction terms were large in the group of sites facing the road with no structures between roads and sites and extremely small in other groups of sites, (5) the daily change patterns of concentration did not depend much on the distances from the road in the area within 350 m from road, and (6) the concentrations of the group at 400 m to 700 m away from No.7 loop road showed higher than those of groups nearer to No.7 loop road, and the magnitudes of the daily variation, the site variation and day/site intercation showed larger than those of groups closer to No.7 loop road, which suggests the existence of the pollution effects of other local roads than No.7 loop road.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
- Spatio-Temporal Variations of Daily Average Concentration of NO2 in an Area with Trunk Roads
- Autoxidation of Methyl linoleate Initiated by Combustion Smoke of Combustibles
- Spatio-Temporal Variations of Daily Average of NO2Concentration in the Vicinity of a Crossroads
- Long-lived Gas-phase Radicals from Combustion
- Effective Combinations of Trapping Adsorbents and Extractive Solvents for Measuring Airborne Pesticides