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Appendix A - Washington State Department of Ecology

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M-18<br />

Final December 2010<br />

Public Review Draft<br />

available to forecast concentrations <strong>of</strong> visibility-impairing pollutants and projected visibility in<br />

2018, the end <strong>of</strong> the first control period covered by the state <strong>of</strong> <strong>Washington</strong>’s Regional Haze SIP.<br />

Pollutant concentrations and hence visibility are likely to be overpredicted on the Least Impaired<br />

Days. The impact <strong>of</strong> modeling is not so clear for the Most Impaired Days. CMAQ modeling<br />

results for SO4 and OMC, 2 <strong>of</strong> the most important pollutants affecting visibility, are generally<br />

expected to be acceptable, but concentrations <strong>of</strong> NO3, the other important pollutant affecting<br />

visibility are likely to be overpredicted.<br />

Reference<br />

Tonnesen, Gail et al., Final Report for the Western Regional air Partnership (WRAP) 2002<br />

Visibility Model Performance Evaluation, WGA Contract Number: 30203, Western<br />

Regional Partnership, Denver CO (February24, 2006).

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