The National Performance Audit Program (NPAP) is one of the major components in the quality assurance of the Nation's air monitoring program. Over the last several years and especially in 1993, the NPAP has undergone a metamorphosis. The paper will explore some of the forces behind this change as well as the resulting changes which include expansion of the NPAP to cover all the criteria pollutants, new audit equipment design, more audit equipment, more sites audited, and changes in the audit site selection process. The paper will include a review of the audit equipment used throughout the program's existence, an examination, pollutant by pollutant, of the number of audits performed each year beginning in 1989, and other enhancements of the expanded NPAP.