東京都市街地騷音調査概要 (<特集>騷音特集号)

抄録

Noise measurements have been performed in 46 areas selected out of six classes of Tokyo City district, namely, the exclusive residential areas, the residential areas, the business areas, the small factory areas, the semi-industrial areas, and the industrial areas. Several representative areas were selected out of each quarters. Each area was a circle 500〜1000m in diameter and a square mesh of points at 100m intervals were selected as points of measurements in each area. The mean value did not change more than 4 phons when the mesh was shifted in the same area. It was revealed that the main part of the city noise was traffic noise, because noise-meters indicated higher levels in streets with streetcars (mean 77 phons) and in streets with great traffics (mean 67 phons) than in the very neighbourhood of factories (mean 57 phons). It was remarkable that the business areas were more noisy than the factory areas except in the suburban areas. The most noisy areas were the amusement areas.