OAR 340-256-0150: Visible Emissions: Opacity Method of Measurement

Edition: Current OARD snapshotEffective: 2020-11-19Last verified: 2026-09-07

Only a trained person may make the opacity observation for purposes of OAR 340-256-0100 through 340-256-0140. A trained person may use a Ringelmann Smoke Chart or DEQ approved opacity equipment to measure emission opacity. [NOTE: Publications referenced are available from the agency.]

Official history and status

Statutory/Other Authority: ORS 468 & 468A

Statutes/Other Implemented: ORS 468A.360

History: DEQ 21-2020, amend filed 11/19/2020, effective 11/19/2020 DEQ 191-2018, minor correction filed 07/18/2018, effective 07/18/2018 DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-024-0035 DEQ 4-1993, f. & cert. ef. 3-10-93 DEQ 8, f. 4-7-70, ef. 5-11-70

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Official source: https://secure.sos.state.or.us/oard/