Toxics Science Advisory Committee July 19, 2016 Salem, Oregon Sue - PowerPoint PPT Presentation

Jun 05, 2023 •350 likes •465 views

Clean Diesel Workgroup Diesel Particulate Matter and the Air Toxics Science Advisory Committee July 19, 2016 Salem, Oregon Sue MacMIllan | Oregon Department of Environmental Quality Air Benchmark Concentrations Protect human health and

Clean Diesel Workgroup Diesel Particulate Matter and the Air Toxics Science Advisory Committee July 19, 2016 Salem, Oregon Sue MacMIllan | Oregon Department of Environmental Quality
Air Benchmark Concentrations • Protect human health and environment • Air Toxics Rule adopted October 2003 • Form an Air Toxics Science Advisory Committee (ATSAC) • Select ambient benchmark concentrations • Adopted as guidelines into rule • Support air program activities
Air Toxics Science Advisory Committee (ATSAC) • First convened in 2004 • Related rulemaking 2006 • Ambient Benchmark Concentrations table 2010 • Reconvened 2015 to review ABCs -- required by rule every 5 years -- 11 meetings Dec. 2014 – Jan. 2016
Air Toxics Science Advisory Committee (ATSAC) Technical science-based work only Committee of seven volunteer outside experts: Toxicology Environmental science/environmental engineering Risk assessment Epidemiology/biostatistics Medicine (physician) with experience in Public Health Air pollution modeling, monitoring, meteorology, or engineering
Air Toxics Science Advisory Committee (ATSAC) • Charged with using only toxicity data available from recognized agencies (e.g., IRIS, OEHHA, ASTDR) to make their recommendations • Recommends ABC revisions or retentions to DEQ
ATSAC Review of Benchmarks • Toxicity data is constantly changing, hence need for intermittent review of ABCs • 52 standing benchmarks were considered for comprehensive toxicity information review; plus 4 new chemicals (phosgene; fluorides; n-propyl bromide, styrene) • 27 of 52 needed review by the ATSAC, including the ABC for diesel particulate matter (DPM)
ATSAC Review of Current ABC for DPM • In 2006, the ATSAC recommended 0.1 ug/m 3 , which was adopted by the EQC • Considered but did not choose Cal Office of Environmental Health Hazard Assessment (OHHEA) Unit Risk Estimate value of 0.0003 per ug/m 3 at that time • New qualitative information available since 2006, but no quantitative • More in-depth review of Cal OEHHA value performed
ATSAC Review of Current ABC for DPM • Majority of 3 of 11 meetings devoted to DPM toxicity information • ATSAC has not yet made a recommendation • For first time, an ATSAC member ATSAC offered to prepare primary calculations for DPM toxicity; still pending
Speaker contact information: Sue MacMillan Air Toxics Science and Policy Analyst Technical Services, Environmental Solutions, Air Division, DEQ 503.229.6458 Macmillan.susan@deq.state.or.us
Documents can be provided upon request in an alternate format for individuals with disabilities or in a language other than English for people with limited English skills. To request a document in another format or language, call DEQ in Portland at 503-229-5696, or toll-free in Oregon at 1-800-452-4011, ext. 5696; or email deqinfo@deq.state.or.us.

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