Summary


Full Method (55Kb)

 

SECTION 7.10
ROAD DUST - UNPAVED ROADS (NON-FARM)

 



EMISSION INVENTORY SOURCE CATEGORY

  Miscellaneous Processes / Road Dust  

EMISSION INVENTORY CODES (CES CODES) AND DESCRIPTION

  645-638-5400-0000 (47399) Unpaved Road Travel Dust - City & County Roads
  645-640-5400-0000 (47407) Unpaved Road Travel Dust - U.S. Forests & Park Roads
  645-644-5400-0000 (47423) Unpaved Road Travel Dust - BLM/BIA Roads

METHOD SUMMARY

This category includes 1993 estimates of fugitive dust particulate matter entrained by vehicular travel on unpaved roads. Road dust emissions are estimated city and county roads, U.S. forests and park roads, and BLM/BIA roads (Bureau of Land Management and Bureau of Indian Affairs).

ACTIVITY DATA SOURCE:  The total miles of unpaved roads in each of the categories listed is derived from the Caltrans document, "Assembly of Statistical Reports, 1993". Based on previous informal surveys, it is assumed that each mile of unpaved road receives ten vehicle passes per day. This, combined with the road miles, is used to compute the county specific vehicle miles traveled (VMT) on unpaved roads.

EMISSION FACTOR SOURCE:  The unpaved road dust emission factor was computed by averaging unpaved road dust emission measurements performed by the University of California, Davis, and the Desert Research Institute. The emissions measurements were performed in the San Joaquin Valley at different sites.

TEMPORAL DATA:  Daily activity on unpaved roads occurs primarily during daylight hours. Activity is assumed to be the same each day of the week. The monthly activity profile is increased during the Spring and Summer months to account for additional recreational travel and drier, dustier roads.

DATE OF THE LAST UPDATE:  August 1997

GROWTH PARAMETER:  On-road VMT is used for the growth parameter. For several counties the growth is set to zero and VMT is not used.


STATEWIDE EMISSIONS SUMMARY (1993 - ANNUAL AVERAGE TONS/DAY)

CES No. 

 TOG 

 CO  

 NOX 

 SOX 

 PM  

47399

0.00

0.00

0.00

0.00

305.7

47407

0.00

0.00

0.00

0.00

118.6

47423

0.00

0.00

0.00

0.00

221.2

Total

0.00

0.00

0.00

0.00

645.4

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This page last revised on October 7, 2004

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