By now every drycleaner should be familiar with the regulations credited by the Environmental Protection Agency (EPA) to control perchloraethylene (PERC) air emissions in 1993. You many hear this rule referred to as NESHAP (National Emission Standard for Hazardous Air Pollutions) or as MACT (Maximum Achievable Control Technology). Regardless of what it is called or where your facility is located, if you are a drycleaners using perchloroethylene, this regulation will affect you. This summary describes NESHAP and outlines your requirements. While the summary should help you understand whether you are affected it is not a substitute for reading and understanding the rule. MILD members receive a free copy of the annual NESHAP Compliance Calendar.