EPA regulations on air quality are complex and require many different assessments and analyses.  Dispersion and receptor models are mathematical methods to describe the simulated relationship among pollutants as they disperse in the atmosphere.  These models are widely used but are complex in design.  Therefore, a laboratory such as RJLG with experience in designing and implementing these models is necessary to ensure accurate, reliable assessments.

Dispersion modeling is used to determine compliance with National Ambient Air Quality Standards (NAAQS) by characterizing atmospheric processes that disseminate pollutants at their source.  Dispersion models also serve to determine culpability.  Receptor modeling characterizes gases and particulate to identify their sources and quantify their contributions to receptors concentrations.  The combination of dispersion and receptor modeling is a comprehensive method that can be used to assess air quality and satisfy EPA requirements.