Widespread Moderate (Code Yellow) PM2.5 were recorded across the Pacific North/Southwest, Great Lakes, Mid Atlantic and Plain states today (top left). The worst PM2.5 conditions, Unhealthy for Sensitive Groups (Code Orange), were measured across central/southern California and Indiana. AOD measurements across the United States were normal, except for the Great Lakes where the MODIS Terra pass indicates slightly elevated conditions (top right). A stable atmosphere with relatively calm winds over the eastern half of the United States is forecast to continue for the rest of the weekend, which will promote favorable weather conditions but perhaps not PM2.5 (bottom left). The Navy Aerosol Analysis and Prediction System (NAAPS) targets the Great Lakes for surface sulfates and forecasts concentrations to remain elevated for the rest of the weekend (bottom right).