Swing state Pennsylvania has one of the largest natural gas deposits in the nation, but residents are concerned about health impacts.

As all eyes look to Pennsylvania, voters across the Commonwealth took to the polls to cast their ballots. With more than one million ballots already sent in by mail, millions more are expected to be cast.

Polls open at 7 a.m. and close at 8 p.m. If you are in line to vote at 8 p.m. you still will be allowed to cast your ballot.  Sign-up for Your Vote: Text with the USA TODAY elections team. It is not necessary in Pennsylvania to show identification to vote unless it is your first time voting at a new polling location.