General Requirements. A person may not cause or permit the discharge of particulate matter into the outdoor atmosphere from a glass melting furnace in excess of the amount determined using the following equation: E = 5 + 0.48 (P) E = 2.27 + 0.24 (P) where: Exception. A person who owns or operates an opal recipe glass melting furnace with an interruptible gas service, as defined in COMAR 26.11.09.01C, may exceed the requirements in Regulation .03A of this chapter and §A of this regulation when gas service is interrupted by the utility if maximum available electric boosting is used in conjunction with an alternative fuel.