Pennsylvania is not among the states in the Northeast and Mid-Atlantic that will initially join the Transportation and Climate Initiative (TCI)—a regional effort to reduce pollution from vehicles. But observers say that state leaders might join later, after more details are worked out.

Observers of the regional Transportation and Climate Initiative (TCI) that has involved Pennsylvania anticipate more announcements before Christmas about how the proposal will evolve in 2021, raising concerns that small businesses would be hurt by an eventual increase in gasoline and diesel prices.