横浜市内の大交通量地点街路上における自動車排ガスよりの大気汚染物質

概要

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For the purpose of investigating the contribution of engine exhausts to urban atmospheric pollution, measurements of contaminants in the atmosphere from engine exhausts were carried out at Takashima-cho, Nishi-ku, one of the heavy traffic junctions in Yokohama during 19621963. As indicators of pollution levels from engine exhausts, the concentration of CO, CO2, SO2, NO, NO2, and Pb in the atmospheric air were measured by using detector tube method and colorimetric method. At the same time, traffic density was obtained, using a manual counter, all the cars and trucks passing the location for 10 min. in each hour. The concentration of CO ranged 140 ppm, CO2 340400 ppm, SO2 0.211.3 pphm, NO 6153 pphm, NO2<164 pphm, Pb 1.441.4 μg/m3. In general, the concentration of these contaminants showed two maximum peaks at nearly 9 o'clock in the morning and nearly 5 o'clock in the evening and also one minimum level at about 4 o'clock in the morning. The correlation between the concentration of air contaminants (CO, NO, NO2 and Pb) and the traffic density was considerably high.
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