07/14/1965
https://www.presidency.ucsb.edu...
"Now, under this legislation, we can halt the trend toward greater contamination of our atmosphere."
"I, Lyndon B. Johnson, President of the United States of America, do hereby call upon officials of the Government and the people of the United States to observe the day of December 17, 1963, with cerem..."
"I am glad to approve this legislation which is to be known as the Clean Air Act."
"This order shall be effective upon its filing for publication in the Federal Register"