The Atmospheric Studies Group (ASG) is a part of TRC Solutions, a subsidiary of TRC Companies, Inc. headquartered in Lowell, Massachusetts. The ASG provides research and consulting services in the environmental and physical sciences with major emphasis on: * Atmospheric pollution dispersion model development * Atmospheric boundary layer research * Air quality permitting, licensing, and regulatory consulting. The ASG also provides intensive training programs in the use of the CALPUFF dispersion model.