Abstract

Title I11 of the Clean Air Act Amendments of 1990 (CAAA) [3] changed the method of operation and drastically increased the scope of federal air toxic provisions. The major thrust of this Congressional restructing of the air toxic or hazardous air pollutant (HAP) provisions of the Clean Air Act was the speedier implementation of regulations limiting emissions of air toxics. The major focus is now maximum available control technology (MACT). The method and means of determining MACT differs significantly from the regulatory development of previous national emission standards for hazardous air pollutants (NESHAPs). In particular, the consideration of control technology and cost has changed. This paper attempts to outline the basic structure of CAAA HAP programs and to provide an update of the status of the development of the implementing regulations, particularly those regarding VOC emissions. The major areas of the HAP programs are as follows:

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