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Overview
Basics
Basics
The EPA Regional Haze Regulations require the use of reconstructed light extinction from aerosol data to track trends in haze at mandatory Class I areas. Long-term monitoring conducted at Bliss State Park and South Lake Tahoe has found that the thresholds were met and visibility has improved since monitoring began. However, the TRPA 2006 Threshold Evaluation report noted concerns over backsliding. This study interpreted 20 years of chemically speciated PM2.5 aerosol data at Bliss SP and 15 years-worth of data at South Lake Tahoe to determine the effects of light scattering and absorption by particles on visibility impairment in the Lake Tahoe Basin.
Completed
2009
2009
2011
$103,007
Alan Heyvaert (alan.heyvaert@dri.edu)
09/20/2017
09/20/2017
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| Location Information | Location Notes |
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Organizations
EIP Details
EIP Basics
EIP Basics
04.01.01.0050 - P061: Lake Tahoe Visibility Impairment Source Apportionment Analysis
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
No annual performance measure accomplishments entered for this project.
Funding
Expected Funding
Expected Funding
$103,007
$103,007
$0
| Total | |||
|---|---|---|---|
| Unknown or Unassigned | $103,007 | $103,007 | $0 |
| Grand Total | $103,007 | $103,007 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2011 | 2010 | 2009 | |
|---|---|---|---|---|
| Southern Nevada Public Land Management Act (Pacifi... | $103,007 | $34,336 | $34,336 | $34,335 |
| Grand Total | $103,007 | $34,336 | $34,336 | $34,335 |
Photos
Other Details
Watersheds
No watersheds set for this project.
Threshold Categories
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The U.S. Environmental Protection Agency Regional Haze Regulations require the use of reconstructed light extinction from aerosol data to track trends in haze at mandatory Class I areas, such as the Desolation Wilderness area in the Lake Tahoe Basin.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
Notes
Notes
| 07/09/2017 9:27 PM | System | Completion Year: 2011 | ||
| 07/09/2017 9:25 PM | System | Objectives: This study was performed to help inform TRPA and other agencies regarding the trends in visibility impairment in the Lake Tahoe Basin and the causes of haze in the basin. In addition to the TRPA, the results of this study will be useful to the states of California and Nevada, which are responsible for submitting regional haze plans to the U.S. Environmental Protection Agency, and to the U.S. Forest Service, which also has responsibilities for protecting its Class 1 areas, including the Desolation Wilderness. |
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| 07/09/2017 9:24 PM | System | Findings: Light scattering and absorption by aerosols are the largest contributions to visibility limitations at all but the cleanest locations where light scattering by clean air (Rayleigh scattering) can be equally or more significant. Three-fourths of the increased light extinction at South Lake Tahoe compared to Bliss State Park was due to much higher organic and elemental carbon aerosol at South Lake Tahoe, especially in winter. Seasonal patterns in light extinction were reversed for the two sites, with Bliss State Park having highest average values in summer due to wildfire impacts and South Lake Tahoe having highest average values in winter due to buildup of residential wood burning and traffic emissions under winter inversion conditions. *** See www.fs.fed.us/PSW/partnerships/tahoescience for additional findings |