The Department of Environmental Protection will hold a public hearing on proposed amendments to the state implementation plan for the Philadelphia-Wilmington Nonattainment Area. The proposed SIP revision demonstrates how the area will attain the PM2.5 standard by April 5, 2010, by presenting evidence from air quality modeling, emission trends, regional pollutant transport impacts and emission reductions through state and federal control measures. The hearing will be March 11, 2010. Written comments are due by March 12, 2010.