Standard for visible emissions.

40 C.F.R. § 60.193
in effect
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(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 cause to be discharged into the atmosphere: (1) From any potroom group any gases which exhibit 10 percent opacity or greater, or (2) From any anode bake plant any gases which exhibit 20 percent opacity or greater.
Source: ecfr_bulkFetched: 7/26/2026
Source: eCFR APIURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-40.xml?part=60Fetched: 5/31/2026

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