2. Historical site design and uses
Between 1968 and 1974, 18 study sites were established
across a west to east gradient of air pollution in
the San Bernardino Mountains. An additional 22 sites
were established around Blue Jay, CA, to examine the
role of topography on crown injury (Arbaugh et al.,
1999). Seedling and sapling study sites were also established
at six sites across the San Bernardino Mountains.
Between 1988 and 1998 additional sites were established
for two major studies, funded, respectively, by the U.S.
Environmental Protection Agency (Grulke, 1999) and the
California Air Resources Board (Air Resources Board,
1998).