treasure valley road dust study: final report - ResearchGate
treasure valley road dust study: final report - ResearchGate
treasure valley road dust study: final report - ResearchGate
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
complete link-level emissions inventories are presented in an electronic format described in an<br />
appendix to this <strong>report</strong>. In this section, we summarize the characteristics of the emissions<br />
inventories and compare them to both prior work, and emissions calculated using the AP-42 silt<br />
loading method.<br />
5.3.1 Paved Roads<br />
Table 5-12 shows the paved <strong>road</strong> <strong>dust</strong> emissions on an average winter day and average<br />
annual emissions for year 2000 as well as for future years. Average winter emissions (81.2 tons<br />
per day) for the year 2000 are 31% higher than average annual emissions (62.0 tons per day). On<br />
an annual average basis, 46.4 tons per day originate from Ada County, accounting for<br />
approximately 75% of the paved <strong>road</strong> <strong>dust</strong> emissions in the Treasure Valley. Annual average<br />
emissions increase in future years over year 2000 emissions by 26%, 42%, and 58% for the years<br />
2010, 2015, and 2020, respectively. Table 5-13 shows that the majority of emissions emanate<br />
from <strong>road</strong>s classified as arterials (57.9% of total on annual average basis). Collectors, interstates<br />
and locals each contribute 11.8%, 19.0% and 11.3% of the total paved <strong>road</strong> emissions,<br />
respectively.<br />
Table 5-12. Year 2000, 2010, 2015, and 2020 paved <strong>road</strong> <strong>dust</strong> emissions by County and Setting<br />
Year County Setting<br />
Average Winter Day<br />
Paved Road Dust<br />
Emissions<br />
(metric tons/day)<br />
Annual Average Daily<br />
Paved Road Dust<br />
Emissions (Metric<br />
tons/day)<br />
2000 Ada Rural 21.7 16.5<br />
2000 Ada Urban 42.2 30.0<br />
2000 Canyon Rural 11.0 10.1<br />
2000 Canyon Urban 6.2 5.5<br />
2000 Ada All 64.0 46.4<br />
2000 Canyon All 17.2 15.6<br />
2000 Ada & Canyon All 81.2 62.0<br />
2010 Ada Rural 22.1 16.8<br />
2010 Ada Urban 58.3 41.8<br />
2010 Canyon Rural 14.4 13.1<br />
2010 Canyon Urban 7.2 6.6<br />
2010 Ada All 80.4 58.6<br />
2010 Canyon All 21.6 19.7<br />
2010 Ada & Canyon All 102.0 78.2<br />
2015 Ada Rural 17.1 13.0<br />
2015 Ada Urban 74.5 53.4<br />
2015 Canyon Rural 16.1 14.6<br />
2015 Canyon Urban 8.0 7.3<br />
2015 Ada All 91.6 66.4<br />
2015 Canyon All 24.1 21.9<br />
2015 Ada & Canyon All 115.7 88.3<br />
2020 Ada Rural 19.1 14.6<br />
2020 Ada Urban 82.0 58.7<br />
2020 Canyon Rural 18.1 16.6<br />
2020 Canyon Urban 9.0 8.3<br />
2020 Ada All 101.1 73.3<br />
2020 Canyon All 27.2 24.8<br />
2020 Ada & Canyon All 128.3 98.2<br />
The distributions of paved <strong>road</strong> <strong>dust</strong> emissions are shown in Figure 5-4. Emissions from<br />
individual links have been normalized with the length of the link. Dark lines indicate higher per<br />
kilometer of <strong>road</strong> emissions than light colored lines. The figure shows that the large sources of<br />
paved <strong>road</strong> <strong>dust</strong> are concentrated in the urban parts of Ada and Canyon Counties as well as the<br />
interstates.<br />
5-13