Subcommittee Briefing, MATI to date

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Subcommittee Briefing, MATI to date

• Maine Air Toxics Initiative Decision of
• November 18, 2005

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Goals of Air Toxics Program

• Maine economy is dependent on healthy citizens
  and a clean environment
• Goal Prevent Unacceptable Risk to Public Health
  from Hazardous Air Pollutants

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What do we mean by Hazardous Air Pollutant?

• Hazardous Air Pollutant means any air pollutant
  that has the potential to harm public health,
  which is not a criteria pollutant.
• Criteria Pollutant means Carbon monoxide (CO),
  Sulfur dioxide (SO2), Nitrogen oxides (NOx),
  Ozone (O3), Fine Particulate Matter (PM10
  PM2.5), and Lead (Pb)

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Existing Maine Air Toxics Program

• Monitoring Data Assessment
• Emission estimates
• Large Point Sources
• Process Standards (MACT)
• Residual Risk
• Area source
• Process Standards for targeted facilities (e.g.
  Dry Cleaners Aluminum Smelters)
• Pollution Prevention Programs
• Mobile Sources
• Fuels
• Pollution Control Equipment

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Why a New Evaluation?

• Public Concern
• New Information Available on Air Toxics Risk
  Assessment
• Approaching final stages of MACT implementation

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If there is a problem...

• What chemicals are causing the problem?
• Where do they come from?
• And therefore, where should we focus time and
  resources?

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Overview of MATI Process
Air Toxics Advisory Committee

• Early Actions
• P2 / TUR
• Other

DEP

• Strawman List of Air Toxics Priorities
• Inventories
• RSEI
• NATA
• Monitoring Data
• Missing Issues
• ( i.e.. Diesel, PM, PBTs)

• Long-term Action
• Voluntary programs (P2)
• Economic Incentives
• Federal Advocacy
• Regulatory Statutory Changes
• Ambient Standards
• Emission Standards
• Technology Standards
• No Action

Final List of Air Toxics Priorities

• Validation
• Monitoring
• Modeling
• Inventory
• Toxic Evaluation
• Missing Issues?

Technical Review Team
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Developing the AT Priority List
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NATA Modeling
AT Priority List
ASPEN
Characterizing Health Risks
HAPEM4
Emissions Inventory
RSEI Toxicity factor
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Factors Assessed to Develop the ATPL

• HAP inventory - update to 2005
• Toxicity Factors - from Risk Screening
  Environmental Indicators (RSEI) model

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Issue - Relative Risk VS Actual Risk

• Once relative risks are determined, how do we
  know which compounds pose an actual risk?

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Use NATA to Benchmark relative risk to actual risk
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Reality Check - Air Monitoring

• Benzene Hotspots near roadways (mobile)
• Tetrachloroethene (dry -cleaners)
• Carbon Tetrachloride (vestigial)
• Mercury (Deposition)
• Low Ambient Concentrations of Metals
• Insufficient Data on Acrolein

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Qualitatively Assess other Factors

• persistence
• bioaccumulation
• Unknowns
• etc.

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November 18, 2005 ATAC Decisions

• Accepts Air Toxics Priority List
• Prudent to begin looking at reduction
  alternatives, while continuing to verify ATPL
• Focus on localized Hot-Spots
• ATAC forms 3 Subcommittees
• Science Advisory Subcommittee
• Stationary Sources Subcommittee
• Mobile Sources Subcommittee

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Subcommittee Charge

• Short Long Term Reduction Strategies
• Reduce most risk for least cost
• Recommendations for ATAC review
• Review existing programs and timeline for
  reductions
• ID no cost control options
• ID other reductions focused at highest risk
  reduction at least cost

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For More Information

• David Wright
• Bureau of Air Quality, DEP
• 17 SHS, Augusta, ME 04333-0017
• 207-287-6104
• David.W.Wright_at_Maine.Gov
• http//www.maine.gov/dep/air/toxics/mati.htm