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.

n1251 - n1252 - n1253 - n1254 - n1255 - n1256 - n1257 - n1258 - n1259 - n1260 - n1261 - n1262 - n1263 - n1264 - n1265 - n1266 - n1267 - n1268 - n1269 - n1270 - n1271 - n1272 - n1273 - n1274 - n1275 - n1276 - n1277 - n1278 - n1279 - n1280 - n1281 - n1282 - n1283 - n1284 - n1285 - n1286 - n1287 - n1288 - n1289 - n1290 - n1291 - n1292 - n1293 - n1294 - n1295 - n1296 - n1297 - n1298 - n1299 - n1300

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