In the article "The sky's the limit" in the February 1999 issue of Environmental Protection, a reference was made to the Clean Air Hazardous Air Pollutants Act regulations. The reference should have read, "...hazardous air pollutants (HAPS) as specified under the Clean Air Act regulations." "If a utility or industrial source finds it needs to emit larger quantities of air pollutants than it currently holds credits for, trading can be used to buy additional credits that allow it to emit more HAPS," should have been printed "...allow it to emit more pollutants." EP regrets any confusion these errors may have caused.

This article originally appeared in the 03/01/1999 issue of Environmental Protection.

About the Author

Mel Zimmerman, PhD, is chair of the Biology Department at Lycoming College Williamsport, Penn., as well as the director of the Clean Water Institute ( His research and publications deal with wastewater parasites and wetlands and stream restoration.

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