Four refineries — three of them next to Wilmington — bought most of the pollution credits, which let them off the hook for installing pollution control equipment and created a hot spot, according to a 1999 report. (thenation.com)
Many of Southern Company's power plants were exempted from the Clean Air Act's 1977 requirements to install modern pollution control equipment because they were built from the 1950s to the 1970s. (polluterwatch.org)