Almost 90 percent of residents in Eastern Massachusetts believe the city has improved over the past two decades, according to the poll, which surveyed a region of 3.3 million living inside Interstate 495. People said they feel safe in Boston, race relations have improved, and the city is better because Boston Harbor is cleaner; the Big Dig buried the expressway; and the development of the Seaport injected vibrancy into a once-forlorn stretch of waterfront.
