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MATES II

Multiple Air Toxics Exposure Study in the
South Coast Air Basin (MATES-II)
Published March 2000

The Multiple Air Toxics Exposure Study (MATES-II) for the South Coast Air Basin was originally published in March 2000.  The online version of the report is presented here as separate "pdf" files of each chapter.

A pdf reader is required to
view and print the document.

To download and view any of the chapters listed below, click the "pdf" icon next to that chapter heading.

 

Contents and Executive Summary

ES-1

Fixed Site (Regional) Program

   

     A. Monitoring

ES-3

     B. Modeling

ES-5

Microscale Program

ES-6

Caveats and Risk Uncertainty

ES-7

 

   

Chapters

   

1. Introduction

1-1

 

2. Historical Trends in Toxic Air Contaminants and
    Associated Cancer Risks in the South Coast Air
    Basin and Vicinity

2-1
 

 

     2.1 Summarized Highlights

2-1

     2.2 Discussion

2-1

 

3. MATES II Monitoring Program

3-1  

     3.1 Site Location and Monitoring

3-1

     3.2 Findings

3-2

        3.2.1 Intersite Comparisons, Concentrations

3-4

        3.2.2 Cancer Risk – Uncertainty in Risk
                Assessment

3-5

        3.2.3 Intersite Comparison Cancer Risk

3-6

        3.2.4 Seasonal Variability

3-13

        3.2.5 Species and Source Apportionment

3-20

 

   

4. Emission Inventory Development

4-1

     4.1 On-Road Mobile Sources

4-1

     4.2 Stationary Point Sources

4-1

     4.3 Area and Off-Road Sources

4-2

     4.4 Summary of Toxic Emissions

4-3

 

   

5. Regional Model Evaluation

5-1

     5.1 3-Dimensional Simulation Models Evaluated

5-1

     5.2 Toxic Compounds Modeled and Model
           Performance Goals

5-1

     5.3 Model-Estimated Spatial Concentration
           Fields

5-4

     5.4 Risk Assessment Calculations

5-4

     5.5 Conclusion

5-9

 

   

6. Microscale Study

6-1

     6.1 Introduction

6-1

     6.2 Site Selection Process

6-1

     6.3 Analytical Approach

6-4

     6.4 Monitoring Results and Findings

6-4

          6.4.1 Microscale-Fixed Site Comparisons

6-5

          6.4.2 Mobile/Stationary Source Influences

6-11

     6.5 Emissions Inventory

6-14

     6.6 Local-Scale Modeling

6-17

 

   

7. Findings and Conclusions

7-1

     7.1 Monitoring Program

7-1

     7.2 Modeling

7-2

     7.3 Microscale Program

7-2

     7.4 Caveats and Uncertainties

7-4

 

   

8. References

8-1

 

   

9. Response to Comments

9-1

 

   

Appendices

   

Cover; Governing Board; Contributors; List of Appendices

 

    I-A    List of Toxic Compounds and Their
            Associated Unit Risk Factors (URF)

 

    I-B    List of Air Toxic Study Technical Review
            Group (ATSTRG) Members

 

    II      Historical Trends in Toxic Air Contaminants
            and Cancer Risk in the South Coast
            Air Basin

 

    III-A  Protocol,
           Environmental Justice Initiative Number 2,
           Monitoring and Laboratory Analysis

 

    III-B  Statistical Summary for the MATES-II
           Fixed Monitoring Sites

 

    IV    1998 Emissions by Major Category

 

    V     Air Toxic Regional Modeling

 

    VI    Details of Microscale Study

 

              Location of Sites

   

              Wind Roses

   

              Emissions

   

              Microscale-Fixed Site Comparisons

   

              Modeling Results