Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/316941 
Year of Publication: 
2025
Series/Report no.: 
CESifo Working Paper No. 11827
Publisher: 
CESifo GmbH, Munich
Abstract: 
This paper analyses trends and persistence in air pollution levels in 88 US metropolitan areas using fractional integration methods. The results indicate that the differencing parameter d is higher than 0 in 38 of the series, which supports the hypothesis of long-memory behaviour and implies that, although the effects of shocks are long-lived, they eventually die out. The highest degrees of persistence are found in the Fresno, Bakersfield, Bradenton and San Diego areas. On the whole the gathered evidence indicates that regional differences in pollution levels are significant, with factors such as industrialisation history and extreme weather events playing a crucial role in their degree of persistence. This suggests that, in order to tackle pollution more effectively, federal environmental policies, such as the Clean Air Act, should be complemented by more targeted ones taking into account local characteristics.
JEL: 
C22
Q53
Document Type: 
Working Paper
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