Section 60.92 - Standard for particulate matter(a) On and after the date on which the performance test required to be conducted by § 60.8 is completed, no owner or operator subject to the provisions of this subpart shall discharge or cause the discharge into the atmosphere from any affected facility any gases which: (1) Contain particulate matter in excess of 90 mg/dscm (0.04 gr/dscf).(2) Exhibit 20 percent opacity, or greater.39 FR 9314, Mar. 8, 1974, as amended at 40 FR 46259, Oct. 6, 1975