EPA is issuing national emission standards for hazardous air pollutants for two area source categories (iron foundries and steel foundries). The requirements for the two area source categories are combined in one subpart. The final rule establishes different requirements for foundries based on size. Small area source foundries are required to comply with pollution prevention management practices for metallic scrap, the removal of mercury switches, and binder formulations. Large area source foundries are required to comply with the same pollution prevention management practices as small foundries in addition to emissions standards for melting furnaces and foundry operations. The final standards reflect the generally achievable control technology and/or management practices for each subcategory.