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PM10 describes inhalable particles, with diameters that are generally 10 micrometers and smaller. This indicator measures the annual average PM10 concentration. Small particulate matter can lodge in the lungs and cause or aggravate the effects of asthma, lung diseases, and heart disease. Elevated concentrations of PM10 can reduce regional visibility and are associated with increased regional haze. The primary sources of PM10 in the Tahoe Basin are motor vehicle emissions, paved and unpaved road dust, wood smoke, wildfire smoke, and construction dust. PM10 is monitored by TRPA and partners at three sites around the Basin.
- Status
- Considerably Better Than Target
- Trend
- Moderate Improvement
- Confidence
- High
- Average levels of particulate matter have decreased over time, especially on the South Shore.
- Reductions in particulate matter on the South Shore can mostly be attributed to reductions in local sources such as increased street sweeping and improving the efficiency of residential wood burning stoves.
- Particulate matter concentrations at DL Bliss show more steady levels over time. Because particulate matter at DL Bliss comes more from regional sources rather than local sources, regional sources of particulate matter do not appear to be dropping as much as local sources.
The location of air quality monitoring stations in the Lake Tahoe Basin. PM10 is monitored by TRPA and partners at three sites around the Basin.
- This indicator measures the annual average concentration of particulate matter less than or equal to 10 microns in size (PM10). In high concentrations this pollutant can lodge in the lungs and cause or aggravate the effects of asthma, lung diseases, and heart disease. Federal and state standards have been adopted to protect the public from this pollutant.
- Particulate matter pollution consists of very small liquid and solid particles in the air. The primary sources of PM10 in the Lake Tahoe Region are motor vehicles, paved and unpaved road dust, wood smoke, and construction dust. The ambient concentration of PM10 is dependent on meteorological conditions such as wind speed and atmospheric mixing.
EIP Indicators
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Miles of Street Sweeping
Since 2009 EIP partners have swept more than 61,000 miles of roadways within the Tahoe Basin reducing fine sediment particles from roadways entering the air and water.
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Non-Compliant Wood Stoves Removed or Retrofitted
This EIP performance measure tracks removal of polluting wood stoves to reduce local air pollution for human and ecosystem health.
Example EIP Projects
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Purchase of High-Efficiency Sweepers - City of South Lake Tahoe
Programs have been put in place for increased street sweeping such as the purchase of high-efficiency street sweepers.
Monitoring Programs
- The current status was determined based on the maximum annual average taken during the most recent year monitoring data is available at any monitoring site in the Region. The highest reading was taken at the South Lake Tahoe Sandy Way site and was 12 µg/m3, 62% of the maximum allowable value of 20 µg/m3. Therefore, the status was determined to be considerably better than target.
- Trend was determined using the annual average reading at the South Lake Tahoe - Sandy Way site from 1994-2019 using the Theil-Sen robust regression method. There was an annual average 1.4% reduction in levels during the time frame. Therefore, the trend was determined to be moderate improvement.
- High. Monitoring was conducted using strict protocols.
- High. A long-term, high-quality data set is available to analyze trend.
- High.
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No documents available.