Two of Maine’s largest paper mills are among the dirtiest in the country, according to a new study on U.S. pulp and paper plants, putting their emissions on par with some oil refineries.

Researchers spent six months reviewing state and federal data for 185 pulp and paper mills across the country, combing through thousands of public records, and visited three mills: one in South ...

The “Mad River Pulp and Paper” mill exhibit will debut on Thursday, June 19, from 4:30 p.m. to 6 p.m. It will be an expansion of the Marie Aull Tribute Garden.