In 1970, former President Richard Nixon and the United States government established the Clean Air Act.
In 1990, former President George H.W.
Bush made several revisions to the Clean Air Act.

That is, however, until very recently.

In 1970, former President Richard Nixon and the United States government established the Clean Air Act.
In 1990, former President George H.W.
Bush made several revisions to the Clean Air Act.

That is, however, until very recently.
