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CALPOST and POSTUTIL

Key Decisions. Visibility calculation methodSpecies to considerSpeciation of PM-10Natural background light extinctionRayleigh scattering valueLight extinction efficienciesInclusion of sea saltUse of ammonia limiting method. Visibility Calculation Method. Screening (12 km)Method 6 w/EPA(2003)

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CALPOST and POSTUTIL

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    1. CALPOST and POSTUTIL CALPOST processes CALPUFF outputs Summarizes concentrations Computes visibility measures POSTUTIL also processes CALPUFF outputs Multiple simulations, deposition fluxes, etc. Chemistry of nitric acid/nitrate aerosols (ammonia limiting effects)

    2. Key Decisions Visibility calculation method Species to consider Speciation of PM-10 Natural background light extinction Rayleigh scattering value Light extinction efficiencies Inclusion of sea salt Use of ammonia limiting method

    3. Visibility Calculation Method Screening (12 km) Method 6 w/EPA(2003) Class I-specific monthly RH values Refined (<= 4 km) Method 6 as above

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