Rhys is an environmental Engineer with more than 7 years of experience in air quality and air dispersion modeling compliance and regulation for several industries such as refining, chemical manufacturing, agriculture, coatings facilities, and energy development. He has conducted and reviewed complex multi-source air dispersion modeling projects consistent with federal and state requirements. His air quality experience highlights are major and minor source dispersion modeling permit application reviews including air quality permitting in attainment and non-attainment areas, NSR/PSD, and emission event analyses. He has also acted as an expert witness regarding air dispersion modeling for public meetings and contested case hearings.