Text of Slides from Presentation
by Ron Myers, EPA/OAQPS
at the Denver PART5 Workshop, 
November 1995


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Particulate Emission Factors

* Paved Roads
* Unpaved Roads

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Paved Road Emission Factors

* Testing Methodologies
* Existing Emissions
* Data Base
* Existing Silt Loading Data Base
* Future Efforts

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Emission Testing Methodologies

* Air Sampling Equipment
* Site Requirements
* Silt Analysis

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Site Requirements

* Open terrain
  - upwind
  - downwind
* No significant obstructions
* Wind Speed & direction
  - 2 to 20 mph
  - ± 45°
* Traffic Requirements
* Silt Content of Roadway

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Existing Emissions Data Base

* Six Studies Considered
* Some Data Excluded
  - Poor Sampling Conditions
  - Poor Documentation
  - Poor Silt Analysis Procedures
* Analysis By Stepwise Regression

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Silt Loading Data Base

* 2/3 from Montana
  - Only Location with full years data
  - Only Data Set with Multiple Samples
* No Relationships Identifiable
  - Road Class
  - Average Daily Traffic
* Seasonal Variabilities
* Poor Uniformity
  - Sampling Methodology
  - Analysis Methodology
  - Roadway Classification

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Future Work

* Near Term (Active)
* Long Term (Dream Land)

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Near Term Work

* Primary Focus is PM-2.5
  - Secondary Focus is PM-10
  - Also Evaluate PM-1
* Test Program in Three Locations
  - Paved Roads
  - Unpaved Roads
* Expectations
  - Significant Revision in PM-2.5 & PM-1 Factors
  - Revision of PM-10 Factors Unlikely

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Long Term Ideas

* Focus on Silt Loading Relationships
  - Traffic Speed
  - Average Daily Traffic Count
  - Temporal Variations Spatial Variations
  - Meterology
* Need Large Database
  - Statistically Designed
  - Consistent Documentation, Collection & Analysis
* Non Linear Statistical Analysis

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