The paper gives an overview of EPA's Limestone Injection with Multistage Burners (LIMB) program, a program for research, development, and demonstration of cost-effective emissions control technology for coal-fired boilers that can reduce both sulfur oxides (SOx) and nitrogen oxides (NOx). The LIMB concept uses low-NOx burners plus sorbent injection to control these pollutants simultaneously. LIMB technology represents a lower cost alternative to currently available SOx control approaches such as flue gas desulfurization, coal cleaning, and coal switching. LIMB technology is especially attractive where coal-fired boilers must be retrofitted to minimize emissions of NOx and SOx, which are major acid rain precursors. This is due to LIMB's relative ease of retrofit to both small and large coal-fired boilers and its lower cost. LIMB performance goals are: (for retrofit) to achieve a 50-60% reduction of both SOx and NOx from uncontrolled levels; and (for new units) to achieve a 70-80% reduction of NOx and a 70-90% reduction of SOx from uncontrolled levels.