(a) The standards shall be applicable, as specified in the individual Subpart, to the levels as described in Part 256 of this Title and as assigned in Subchapter C. In addition, emissions in a classified area shall be controlled to the extent required to be compatible with standards established in other areas.

(b) The procedures and techniques employed to determine ambient air concentrations of contaminants shall be as specified in the standard or in accordance with other methods or techniques acceptable to the commissioner. Acceptable methods may be published from time to time by the commissioner.