Federal Highway Administration April 16, 2018 – Federal Register Recent Federal Regulation Documents

The FHWA withdraws its August 4, 2014, Notice of Proposed Rulemaking (NPRM), which proposed to establish a weighting factor of 5.0, to be used in determining the weighted population of fine particulate (PM2.5) nonattainment areas. The Moving Ahead for Progress in the 21st Century Act (MAP-21) language for the CMAQ Program funds that must be obligated for PM2.5 projects in PM2.5 nonattainment and maintenance areas (referred to in this document as a ``set-aside'') instructs that the set-aside be calculated based on ``weighted population'' in PM2.5 nonattainment areas. Because the statute did not specify the values to be applied to determine the weighted population, FHWA had previously initiated a rulemaking to establish the weighting factor. After reviewing the record in this matter, FHWA withdraws the NPRM.