The move highlights widespread concern that the E.P.A. will silence government scientists from speaking publicly or conducting work on climate change. Scott Pruitt, the agency administrator, has said that he does not believe human-caused greenhouse gas emissions are primarily responsible for the warming of the planet.

“It’s definitely a blatant example of the scientific censorship we all suspected was going to start being enforced at E.P.A.,” said John King, a professor of oceanography at the University of Rhode Island who chairs the science advisory committee of the Narragansett Bay Estuary Program. “They don’t believe in climate change, so I think what they’re trying to do is stifle discussions of the impacts of climate change.”

Monday’s conference is designed to draw attention to the health of Narragansett Bay, the largest estuary in New England and a key to the region’s tourism and fishing industries. Rhode Island’s entire congressional delegation, all Democrats, will attend a morning news conference. Sen. Sheldon Whitehouse, an outspoken critic of Mr. Pruitt, will be among the speakers.

Scientists there will unveil the report on the state of the bay, which E.P.A. scientists helped research and write. Among the findings will be that climate change is affecting air and water temperatures, precipitation, sea level and fish in and around the estuary.

Autumn Oczkowski, a research ecologist at the E.P.A.’s National Health and Environmental Effects Research Laboratory Atlantic Ecology Division in Rhode Island, was scheduled to give the keynote address. Colleagues familiar with her speech said she intended to address climate change and other factors affecting the health of the estuary.