Variances may be permitted

The provisions of this chapter do not prohibit the discharge of air contaminants to a greater extent or for a longer time, or both, than permitted by KRS 77.150 to 77.175 or by rules, regulations, or orders of the air pollution control board, if not of a greater extent or longer time than the hearing board or a court after a hearing before the hearing board finds necessary pursuant to the provisions of KRS 77.245 to 77.275.