Greenwire: When Baltimore launched the Charm City Circulator in 2010, officials boasted that the free, all-hybrid bus service was the first of its kind in the country. The city has also expanded its network of bicycle lanes in recent years and introduced electric vehicle charging stations as part of a larger, statewide effort to reduce greenhouse gas emissions.
Yet for all those improvements, Maryland still suffers from the worst ozone pollution of any state east of the Mississippi River, according to the...