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SO2 NAAQS Modeling

Purpose of today's discussion . Explore with largest SO2 sources how to accomplish modeling required under new 1-hour SO2 NAAQS Identify issues/concerns for a follow-up stakeholder meeting with larger group of sources in early 2012Provide input for a NESCAUM modeling protocol . 2. Revised SO2 NAAQ

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SO2 NAAQS Modeling

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    1. SO2 NAAQS Modeling MassCAIR Stakeholder Meeting December 13, 2011

    2. Purpose of today’s discussion Explore with largest SO2 sources how to accomplish modeling required under new 1-hour SO2 NAAQS Identify issues/concerns for a follow-up stakeholder meeting with larger group of sources in early 2012 Provide input for a NESCAUM modeling protocol 2

    3. Revised SO2 NAAQS EPA replaced the existing annual and 24-hour SO2 standards with a new 1-hour SO2 standard of 75 parts per billion (ppb) effective 8/2011 Unlike other NAAQS, EPA is proposing to determine an area’s compliance using both ambient monitoring and air dispersion modeling of SO2 sources 3

    4. SO2 Milestones 4

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