2. For each of the 5 years comprising the base period, calculate the mean deciviews for
the 20% of days with worst and 20% of days with best visibility. For each Class I area,
calculate the 5 year mean deciviews for worst and best days from the five year-specific
3. Use an air quality model to simulate base period emissions and future emissions. Use
the resulting information to develop relative response factors for each component of
particulate matter identified on the right hand side of Equations (6.1) and/or (6.2).
4. Multiply the relative response factors times the measured species concentration data
during the base period (for the measured 20% best and worst days). This results in daily
future year species concentrations data.
5. Using the results in Step 4 and the IMPROVE algorithm (equation 6.1 or 6.2),
calculate the future daily extinction coefficients for the 20% best and 20% worst
visibility days in each of the five base years.
76For the regional haze calculations, the f(rh) factors have been capped at the f(rh) value
associated with 95% relative humidity. Relative humidity value above 95% use the same value.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD