The Department of Environmental Quality amended 9 Va. Admin. Code §§5.10 and 5.80, General Definitions and Permits for Stationary Sources. Changes revise the permitting program for PSD relating to fine particulate matter by adding maximum allowable increases in ambient pollutant concentrations, two significant impact levels, and a significant monitoring concentration for fine particulate matter. http://legis.state.va.us/codecomm/register/vol27/iss23/v27i23.pdf pp. 2477-506.