40 CFR § 408.105
Standards of performance for new sources
June 9, 2020
The following standards of performance establish the quantity or quality of pollutants or pollutant properties, controlled by this section, which may be discharged by a new source subject to the provisions of this subpart: No pollutants may be discharged which exceed 1.27 cm (0.5 inch) in any dimension.
[40 FR 55781, Dec. 1, 1975]