Hazardous Air Pollutants

Currently, emissions of hazardous air pollutants (HAPs) are not regulated by the EPA, although mercury regulations will be implemented by 2007. Emissions of HAPs from coal-fired power plants have been estimated by the EPA, which performed a study (i.e., Study of Hazardous Air Pollutant Emissions from Electric Utility Steam Generating Units) to determine the quantity of hazardous air pollutants being emitted from fossil-fuel-fired power plants [37]. In this study, discussed earlier, HAP emissions tests data were gathered from 52 utility units (i.e., boilers), including a range of coal-, oil-, andnatural-gas-fired utility boilers. The emission tests data, along with facility specific information (e.g., boiler type, control devices, fuel usage) were used to estimate HAP emissions from all 684 utility plants in the United States. These utilities are fueled primarily by coal (59%), oil (12%), or natural gas (29%). Many plants have two or more units, and several plants burn more than one type of fuel (e.g., contain both coal- and oil-fired units). In 1990, 426 plants burned coal as one of their fuels, 137 plants burned oil, and 267 plants burned natural gas. The overall summary of the study is presented in Table 4-14,

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