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Portland, OR—The Oregon Department of Environmental Quality has reopened the public comment period on revisions to 23 standing Ambient Benchmark Concentrations. The rulemaking will also add new benchmarks for phosgene, n-propyl bromide, and styrene. DEQ is also proposing some minor plain language edits and to add which statutes the rules are implementing.

Under this rulemaking, DEQ would approve rule amendments to division number 246 under Oregon Administrative Rule 340.

DEQ has reopened the public comment period due to amendments made to the rulemaking's fiscal impact statement. An advisory committee that convened to evaluate the original fiscal impact statement provided input resulting in the amendment.

Public Participation

DEQ will accept public comments on this proposed rulemaking until 4:00 p.m. on Feb. 8, 2018. You may submit comments online through the Air Toxics Benchmark Review Comment page at:

To view copies of the notice documents, learn more about this rulemaking, and how to submit comments, you can view the rulemaking web page at:

You can also obtain more information about this rulemaking by contacting:

Sue MacMillan
700 NE Multnomah St., Suite 600
Portland, OR 97232

Matthew Van Sickle, Public Affairs, DEQ, 503-229-6044,


Environment & Energy