The Great Bay Municipal Coalition will hold a news conference on Monday to share recent data regarding the environmental conditions of the Great Bay Estuary and to also provide an update on the Coalition’s activities. That news conference is set for 10 am at the McConnell Center in Dover, where Dover Mayor Dean Trefethen, Portsmouth Mayor Eric Spear, and Rochester Mayor T.J. Jean will be among those addressing the crowd. The Municipal Coalition members include Dover, Portsmouth, Rochester, Exeter, and Newmarket.