Many areas of the country still must adopt and implement additional measures to meet the Clean Air Act (CAA) SIP requirements for attainment, reasonable further progress (RFP), rate of progress (ROP) or maintenance of the National Ambient Air Quality Standards (NAAQS). Some areas have implemented most available traditional emissions control strategies and want to try new types of pollutant reduction strategies to attain or maintain the NAAQS. However, States are often either discouraged from adopting or overlook certain innovative measures because they are typically small-scale and may not individually result in significant SIP emissions reductions credit. In the aggregate, however, such measures can result in a positive impact on air quality and may have other benefits not directly related to attaining or maintaining the NAAQS. This policy supports the development of additional emissions reductions from innovative approaches to improving air quality by providing provisional pollution reduction credit up-front towards achievement of attainment, RFP, ROP or maintenance requirements from a group, or 'bundle,' of pollution control measures or strategies considered in the aggregate.