Abstract
Forests in central and southern Arizona are exposed to relatively high concentrations of ozone and other pollutants (Chapter 3) that result from point sources (such as copper smelters) and urban areas (such as Phoenix and Tucson). To the north and east of the urban areas, air quality is better and forest exposure to pollutants is lower. We used a series of analytical strategies to evaluate the nature of variability in the annual growth increments of 41 tree-ring chronologies in forests from across central and southern Arizona and southern New Mexico.
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