The top 10 neighbors for U.S. EPA span five distinct subcategories — magazines, news publishers, activism organizations, journalists, and humor/satire — with scores compressed into a narrow band from 0.93 down to 0.92, the defining signature of a flat shape.

Smithsonian Magazine leads at 0.93, followed closely by NPR Politics (0.93) and Guardian Science (0.93). Neither of those is a government entity — the EPA's own subcategory, Government, has no representative in the top 10. Instead, the cluster is dominated by public-interest media and civic organizations. News publishers and podcasts/radio account for the largest share of the broader neighbor set, but within the top 10 specifically, the mix includes two magazines (Smithsonian Magazine, Scientific American), two news publishers (NPR Politics, Guardian Science), two activism organizations (March For Science at 0.92, Media Matters at 0.92), one journalist (Tamara Keith at 0.92), one website (grist at 0.92), one podcast/radio outlet (Fresh Air at 0.92), and one humor/satire account (The Mysterious LOLGOP at 0.92). The cross-kind pattern is the central finding: the EPA's audience shape aligns with science-and-civics media consumers and activist-adjacent audiences, not with other government entities.

The flat distribution across these subcategories suggests an audience defined less by institutional loyalty than by a consistent orientation toward public-interest information across multiple formats.