According to the American Lung Association, all of our state’s counties receive a grade of “F” when it comes to the ozone. Metro-North mostly runs its trains on electricity, but its diesels are downright filthy as are local buses, though many fleets are converting to natural gas or electric operation. Even shipping by water contributes to pollution, though you hardly think about it as you’re breathing in the brisk air of Long Island Sound. We worry so much about traffic and getting where we must, quickly and safely. Maybe we should also think about how our transportation choices affect our health.