In the 13th episode of "Groundtruth," Associate Lauren Karam (Boston) speaks with Stella Keck, a Senior Scientist at Roux, and Andrew Shapero, a Senior Engineer at Roux. Lauren, Stella, and Andrew discuss new regulations in Massachusetts involving cumulative impact analyses for air permit issues in areas near environmental justice (EJ) communities, and how the U.S. Environmental Protection Agency and other states address cumulative impacts in EJ communities.