The South Coast Air Quality Management District (AQMD) will hold a public hearing on proposed amendments to Rule 1156, Further Reductions of Particulate Matter Emissions from Cement Manufacturing Facilities. The amendments address elevated particulate matter emissions, including hexavalent chromium, from cement manufacturing facilities. The hearing will be March 6, 2009. Comments are due February 24, 2009. http://www.aqmd.gov/pub_edu/nph_1156_Mar_6_09.html.