Calculation of SO & NO For Visibility Screening =

4 3

1. Run appropriate long range transport screening model.

2. Assume no conversion of SO or NO to other species. 2 X

(i.e. assume all NO is emitted as NO and that all SO X 2 2

remains inert at this step.)

3. Multiply the hourly concentrations of SO and NO by 2 X

the ratios of the molecular weights of the secondary

species to the primary species.

Note: The molecular weights of SO and SO are 64 2 4

=

and 96 and the molecular weights of NO and 2

NO are 46 and 62. Thus multiplying the

3

concentration of SO by 1.5 will yield the 2

concentration of SO and multiplying the =

4

concentration of NO by 1.35 will yield the 2

concentration of NO .

3

4. The averaging time of interest is generally 1-hour.

Inset 1 - Method for calculating concentrations of SO and NO =

4 3

from SO and NO . 2 X

The procedures in Appendix B should be used to estimate the

visibility impacts.

5.1.3 Level I Analysis of Long Range Transport and

Depositional Impacts

If a Level I approach is to be taken for depositional

impacts, it should be assumed that concentrations of SO and NO 2 X

are deposited as SO and HNO (see Inset 2). Since the steady- 2 3

state, Gaussian plume models do not actually remove any mass

from the plume, when run in their recommended modes, this will

provide a conservative deposition estimate.

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