Despite their best efforts, scientists can't prove the connection between industrial plants emitting noxious chemicals and geographical outliers in cancer numbers.
Excerpt:
Critics say there was a key flaw in the registryâs study: It looked at county-wide numbers, a data set large enough to subsume and hide the high number of cancer-stricken residents living right near the coal ash pond. This deficiency is representative of a larger problem that characterizes most attempts to uncover whatâs behind suspected but unconfirmed geographical cancer clusters: Often, researchers canât get the granular data they need forproof. âWith environmental exposures, itâs much more difficult to measure at the individual level,â says Hal Morgenstern, a University of Michigan epidemiologist who studies cancer clusters. âEven with people living in the same neighborhoods, some may be exposed while others arenât.â









