The Department of Environmental Protection will hold a public hearing on proposed amendments to 310 Mass. Code Regs. 6.00 and 7.00, Air Pollution Control PM 2.5. These amendments would apply to all air pollution control districts. The changes amend the state ambient air quality standards to bring them into conformance with the current NAAQS for lead, ozone, and fine particulate matter. The hearing will be August 4, 2009. http://www.mass.gov/dep/service/regulations/newregs.htm#aaqs.