Abstract
Findings of inverted-U relationships between income and certain types of pollution have generated considerable controversy, yet relatively little is known about the factors underlying these relationships. U.S. emissions of several major air pollutants have begun to decline, mirroring the trajectories found using data across countries and across time. This paper examines U.S. emissions of six air pollutants between 1970 and 1990, decomposing the observed changes into scale, composition, energy efficiency, energy mix, and other technique effects. Our results provide a case study of the relative importance of these effects for a country on the downward-sloping portions of its emissions trajectories for the pollutants we examine.
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