This report presents economic impact information for alternative eight-hour carbon monoxide national ambient air quality standards. The alternatives are 7 ppm, 9 ppm, and 12 ppm (on a daily maximum basis, where the highest eight-hour average for a day is used to determine if the expected number of exceedances of the standard is less than or equal to one per year). An Urban and Community Impact standard is included as part of the report. Cost and economic impacts of CO emission controls on selected industries were investigated. The analyses included capital and annualized control costs, availability of financial capital for control requirements, and potential product price and output impacts.