Abstract
To reduce CO2 emission by automobile usage, urban layout control such as making compact city regarded as the efficient method. This study aims to estimate CO2 emission by automobile usage at 38 cities from 1987 to 2005 based on National Person Trip Survey. The findings is that though urban density (compactness) in each city affects CO2 emission by automobile, no city could reduce the CO2 emission level during this period. It is also clarified that the increase of local automobile users is the most significant factor to affecthe time series changes of CO2 emission by automobile.
