treasure valley road dust study: final report - ResearchGate

4.1.1 Converting TRAKER Data Into Emissions Potentials........................................4-2
4.1.2 Associating TRAKER Data With Roads and Settings.........................................4-2
4.1.3 Size Distributions of Road Dust Emissions: The relationship between PM 2.5 and
PM 10 emissions.................................................................................................................4-6
4.2 TRAKER STREET SURVEYS......................................................................................4-7
4.2.1 Paved Roads.....................................................................................................4-7
4.2.1.1 Effect of Speed and VMT .............................................................................4-9
4.2.2 Unpaved Roads...............................................................................................4-14
4.3 TRAKER LOOP ......................................................................................................4-14
4.3.1 Temporal Changes in Paved Road Dust Emissions .........................................4-16
4.3.2 Meteorological Effects on Unpaved Road Emissions.......................................4-20
4.4 SPECIAL STUDIES ....................................................................................................4-21
4.4.1 Winter Sanding Experiment ............................................................................4-21
4.4.1.1 Testing Protocol..........................................................................................4-21
4.4.1.2 Test Results ................................................................................................4-24
4.4.2 Summer Street-Sweeping Experiment..............................................................4-26
5. EMISSIONS INVENTORIES FOR THE TREASURE VALLEY ..............................5-1
5.1 EMISSIONS INVENTORY FOR PAVED ROADS.................................................................5-1
5.1.1 Year 2000 Paved roads.....................................................................................5-1
5.1.1.1 Emissions potentials......................................................................................5-1
5.1.1.1a Roads covered by Traffic Demand Model.................................................5-2
5.1.1.1b Residential Roads.....................................................................................5-2
5.1.1.2 Emissions for dry paved roads.......................................................................5-2
5.1.1.2a PM 10 and PM 2.5 Correlation......................................................................5-6
5.1.1.3 Accounting for precipitation..........................................................................5-6
5.1.1.4 Winter average and annual average emissions...............................................5-6
5.1.2 Future year paved road emissions.....................................................................5-7
5.1.3 Episodic paved road emissions .........................................................................5-7
5.1.3.1 December 20 –26, 1999 ................................................................................5-7
5.1.3.2 January 1 – 9, 1991.......................................................................................5-7
5.1.3.2a January 1 – 9, 2000, 2010, 2015, 2020......................................................5-9
5.2 EMISSIONS INVENTORY FOR UNPAVED ROADS.............................................................5-9
5.2.1 Accounting for unpaved roads in Ada County ...................................................5-9
5.2.2 Accounting for unpaved roads in Canyon County..............................................5-9
5.2.3 Accounting for precipitation effects on unpaved road dust emissions ..............5-10
5.2.4 Attribution of unpaved road dust to links in existing Traffic Demand Model
network 5-12
5.3 RESULTS OF ROAD DUST EMISSIONS INVENTORIES.....................................................5-12
5.3.1 Paved Roads...................................................................................................5-13
5.3.2 Unpaved Roads...............................................................................................5-14
5.3.3 Comparisons of Road dust emissions with prior work and silt loading............5-16
6. MODIFICATIONS OF ROAD DUST EMISSIONS INVENTORIES FOR
DISPERSION MODELS .......................................................................................................6-1
6.1 METHODS .................................................................................................................6-1
6.2 RESULTS ...................................................................................................................6-4
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