摘要：For the purpose of investigating actual conditions of air pollution in the street area due to automobile exhaust gas, etc., an investigation was made into the environments for a total of 13 days in both the winter and summer seasons in 1965 through 1967, and the results obtained were examined in together with continuously measured data from an air pollution monitoring station located about 1.2km northeast of an intersection point. The measuring items include traffic volume, dust, lead, weathering condition, sulfur. dioxide, carbon, monoxide, carbon dioxide, aldehydes, nitrogen oxides, ozone, and hydrocarbons. As a result, a high correlation was obtained between the street area data and the station data for sulfur dioxide and suspended particulate matter under both wind velocity conditions of 2.2m/s or less and 3.1m/s or more, as compared with the data from the station. In comparison with the data so far obtained, it was found that the amount of dust and lead totalled as high as approx. 20 times as much and that of CO is approx. Twice as much but that the amounts of NOx and total hydrocarbons remained unchanged. As regards possible correlations between the measuring items, higher positive correlations were noticeably observed between traffic volume and variations in CO value of each hour on the side walk and O3, among lead and CO and aldehydes, between SO2 and lead, between CO and aldehydes, and between atmospheric temperature and O3. Also, higher negative correlations were observed between atmospheric temperature and lead, between SO2 and dust, and between aldehydes and NO and NO2.
