To pass S. 3112, the clean air act amendments of 1966.

On Jul 12, 1966, the Senate voted 80–0 (S 3112). Result: passed. By party: Democrats 64–0, Republicans 33–0. It was a bipartisan vote: majorities of both parties voted yes.

During the 89th Congress (1965–1966), Lyndon B. Johnson was president, and Democrats held majorities in both the House and Senate.

Yes: 80
No: 0
Did not vote: 6
Date: Jul 12, 1966

By party

Democrats64 yes · 0 no · 6 didn’t vote
Republicans33 yes · 0 no

Who broke with their party

Every member who voted sided with their party's majority.

The bill

S. 3112: A bill to amend the Clean Air Act so as to authorize grants to air pollution control agencies for maintenance of air pollution control programs in addition to present authority for grants to develop, establish, or improve such programs; make the use of ap

How each senator voted: Yes

Did not vote

Other votes

From Voteview roll call records.

Cite or embed this page

Capitol Receipts, “To pass S. 3112, the clean air act…: Senate Vote, Jul 12, 1966,” https://www.capitolreceipts.com/vote/89-S-348/to-pass-s-3112-the-clean-air-act-amendments (accessed 2026-10-17).