This action promulgates national emission standards for hazardous air pollutants (NESHAP) for new and existing sources that coat metal coil. The EPA has identified metal coil surface coating as a major source of hazardous air pollutant (HAP) emissions such as methyl ethyl ketone, glycol ethers, xylenes (isomers and mixtures), toluene, and isophorone. Each of these major HAP can cause reversible or irreversible toxic effects following sufficient exposure. The potential toxic effects include eye, nose, throat, and skin irritation, and blood cell, heart, liver, and kidney damage. The final rule implements section 112(d) of the Clean Air Act (CAA) and will require all new and existing metal coil coating operations that are major sources to meet HAP emission standards reflecting the application of the maximum achievable control technology (MACT). The EPA estimates that the final rule will reduce nationwide HAP emissions from metal coil coating operations by approximately 53 percent. The emissions reductions achieved by these NESHAP, when combined with the emissions reductions achieved by other similar standards, will provide protection to the public and achieve a primary goal of the CAA.