IRVINE, Calif., July 18 -The ranks of American states, counties and cities impatient with the pace of international efforts to protect the earth's ozone layer are swelling.  The latest action comes from conservative Orange County, where the City Council of Irvine voted 4 to 1 tonight to approve what Is believed to be the most far-reaching measure yet to control ozone-depleting chemicals. 

The Irvine ordinance will prohibit the use of nearly will chlorofluorocarbons, or CFC's, and related compounds In any industrial process, except in the manufacture of drugs and medical devices and when military specifications call for them. It will ban the sale and use of styrofoam food packaging, ifthe chemical compounds were used in their manufacture, and it will prohibit the use of building insulation containing the compounds.