Ambient Air Quality Standards For Fluorides

Primary and secondary air quality standards are those concentrations in the ambient air which result in a total fluoride content in vegetation used for feed and forage of no more than: (3-28-23) 01. Annual Standard. Forty (40) ppm, dry basis -- annual arithmetic mean. (3-28-23) 02. Bimonthly Standard. Sixty (60) ppm, dry basis -- monthly concentration for two (2) consecutive months. (3-28-23) 03. Monthly Standard. Eighty (80) ppm, dry basis -- monthly concentration never to be exceeded. (3-28-23) 578. (RESERVED)