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Visibility

Visibility in Mandatory Federal Class I Areas, 1994-1998
A Report to Congress

List of Figures

ES–1. Locations of IMPROVE Particulate Matter Samplers Operating Continuously from 1994–1998
ES–2. Relationship Between the Light Extinction, Deciview, and Visual Range Scales
1–1. Visibility Impairment (Haze) in Glacier National Park, Montana
1–2. Visibility Impairment (Haze) in Shenandoah National Park, Virginia
1–3. Relationship Between the Light Extinction, Deciview, and Visual Range Scales
1–4. Locations of IMPROVE Particulate Matter Samplers Operating Continuously from 1994–1998
AL–1. Mandatory Federal Class I Area and IMPROVE Monitoring Site in Alabama
AL–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Sipsey IMPROVE Particulate Sampler
AL–3. Seasonal Deciview Averages from 1992–1998 for the Sipsey IMPROVE Particulate Sampler
AL–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Sipsey IMPROVE Particulate Sampler
AL–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Sipsey IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AL–6
. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Sipsey IMPROVE Particulate Sampler
AK–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Alaska
AK–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Denali IMPROVE Particulate Sampler
AK–3. Seasonal Deciview Averages from 1988–1998 for the Denali IMPROVE Particulate Sampler
AK–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Denali IMPROVE Particulate Sampler
AK–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Denali IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AK–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Denali IMPROVE Particulate Sampler
AZ–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Arizona
AZ–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Chiricahua IMPROVE Particulate Sampler
AZ–3. Seasonal Deciview Averages from 1988–1998 for the Chiricahua IMPROVE Particulate Sampler
AZ–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Chiricahua IMPROVE Particulate Sampler
AZ–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Chiricahua IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AZ–6
. Contributions to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Chiricahua IMPROVE Particulate Sampler
AZ–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1989–1997 for the Grand Canyon IMPROVE Particulate Sampler
AZ–8. Seasonal Deciview Averages from 1989–1998 for the Grand Canyon IMPROVE Particulate Sampler
AZ–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Grand Canyon IMPROVE Particulate Sampler
AZ–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Grand Canyon IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AZ–11
. Contributions to Calculated Annual Aerosol Light Extinction from 1989–1997 for the Grand Canyon IMPROVE Particulate Sampler
AZ–12. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1990–1998 for the Indian Garden IMPROVE Particulate Sampler
AZ–13. Seasonal Deciview Averages from 1990–1998 for the Indian Garden IMPROVE Particulate Sampler
AZ–14. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Indian Garden IMPROVE Particulate Sampler
AZ–15. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Indian Garden IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AZ–16. Contributions to Calculated Annual Aerosol Light Extinction from 1990–1998 for the Indian Garden IMPROVE Particulate Sampler
AZ–17. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Petrified Forest IMPROVE Particulate Sampler
AZ–18. Seasonal Deciview Averages from 1988–1998 for the Petrified Forest IMPROVE Particulate Sampler
AZ–19. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Petrified Forest IMPROVE Particulate Sampler
AZ–20. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Petrified Forest IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AZ–21. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for Petrified Forest IMPROVE Particulate Sampler
AZ–22. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Tonto IMPROVE Particulate Sampler
AZ–23. Seasonal Deciview Averages from 1988–1998 for the Tonto IMPROVE Particulate Sampler
AZ–24. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Tonto IMPROVE Particulate Sampler
AZ–25. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Tonto IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AZ–26. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Tonto IMPROVE Particulate Sampler
AR–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Arkansas
AR–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Upper Buffalo IMPROVE Particulate Sampler
AR–3. Seasonal Deciview Averages from 1992–1998 for the Upper Buffalo IMPROVEParticulate Sampler
AR–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Upper Buffalo IMPROVE Particulate Sampler
AR–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Upper Buffalo IMPROVE Particulate Sampler
Spring Summer Autumn Winter
AR–6. Contribution to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Upper Buffalo IMPROVE Particulate Sampler
CA–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in California
CA–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Lassen Volcanic IMPROVE Particulate Sampler
CA–3. Seasonal Deciview Averages from 1988–1998 for the Lassen Volcanic IMPROVEParticulate Sampler
CA–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Lassen Volcanic IMPROVE Particulate Sampler
CA–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Lassen Volcanic IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Lassen Volcanic IMPROVE Particulate Sampler
CA–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988-1998 for the Pinnacles IMPROVE Particulate Sampler
CA–8. Seasonal Deciview Averages from 1988–1998 for the Pinnacles IMPROVE Particulate Sampler
CA–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Pinnacles IMPROVE Particulate Sampler
CA–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Pinnacles IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–11. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Pinnacles IMPROVE Particulate Sampler
CA–12. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Point Reyes IMPROVE Particulate Sampler
CA–13. Seasonal Deciview Averages from 1988–1998 for the Point Reyes IMPROVE Particulate Sampler
CA–14. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Point Reyes IMPROVE Particulate Sampler
CA–15. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Point Reyes IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–16. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Point Reyes IMPROVE Particulate Sampler
CA–17. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Redwood IMPROVE Particulate Sampler
CA–18. Seasonal Deciview Averages from 1988–1998 for the Redwood IMPROVE Particulate Sampler
CA–19. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Redwood IMPROVE Particulate Sampler
CA–20. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Redwood IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–21. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Redwood IMPROVE Particulate Sampler
CA–22. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the San Gorgonio IMPROVE Particulate Sampler
CA–23. Seasonal Deciview Averages from 1988–1998 for the San Gorgonio IMPROVEParticulate Sampler
CA–24. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the San Gorgonio IMPROVE Particulate Sampler
CA–25. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the San Gorgonio IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–26. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the San Gorgonio IMPROVE Particulate Sampler
CA–27. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Yosemite IMPROVE Particulate Sampler
CA–28. Seasonal Deciview Averages from 1988–1998 for the Yosemite IMPROVE Particulate Sampler
CA–29. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Yosemite IMPROVE Particulate Sampler
CA–30. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Yosemite IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CA–31. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Yosemite IMPROVE Particulate Sampler
CO–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Colorado
CO–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Great Sand Dunes IMPROVE Particulate Sampler
CO–3. Seasonal Deciview Averages from 1988–1998 for the Great Sand Dunes IMPROVEParticulate Sampler
CO–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Great Sand Dunes IMPROVE Particulate Sampler
CO–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Great Sand Dunes IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CO–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Great Sand Dunes IMPROVE Particulate Sampler
CO–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Mesa Verde IMPROVE Particulate Sampler
CO–8. Seasonal Deciview Averages from 1988–1998 for the Mesa Verde IMPROVE Particulate Sampler
CO–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Mesa Verde IMPROVE Particulate Sampler
CO–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Mesa Verde IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CO–11. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Mesa Verde IMPROVE Particulate Sampler
CO–12. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Rocky Mountain IMPROVE Particulate Sampler
CO–13. Seasonal Deciview Averages from 1988–1998 for the Rocky Mountain IMPROVE Particulate Sampler
CO–14. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Rocky Mountain IMPROVE Particulate Sampler
CO–15. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Rocky Mountain IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CO–16. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Rocky Mountain IMPROVE Particulate Sampler
CO–17. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Weminuche IMPROVE Particulate Sampler
CO–18. Seasonal Deciview Averages from 1988–1998 for the Weminuche IMPROVEParticulate Sampler
CO–19. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Weminuche IMPROVE Particulate Sampler
CO–20. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Weminuche IMPROVE Particulate Sampler
Spring Summer Autumn Winter
CO–21. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Weminuche IMPROVE Particulate Sampler
FL–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Florida
FL–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1993–1998 for the Chassahowitzka IMPROVE Particulate Sampler
FL–3. Seasonal Deciview Averages from 1993–1998 for the Chassahowitzka IMPROVEParticulate Sampler
FL–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Chassahowitzka IMPROVE Particulate Sampler
FL–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Chassahowitzka IMPROVE Particulate Sampler
Spring Summer Autumn Winter
FL–6. Contributions to Calculated Annual Aerosol Light Extinction from 1993–1998 for the Chassahowitzka IMPROVE Particulate Sampler
GA–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Georgia
GA–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Okefenokee IMPROVE Particulate Sampler
GA–3. Seasonal Deciview Averages from 1992–1998 for the Okefenokee IMPROVE Particulate Sampler
GA–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Okefenokee IMPROVE Particulate Sampler
GA–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Okefenokee IMPROVE Particulate Sampler
Spring Summer Autumn Winter
GA–6
. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Okefenokee IMPROVE Particulate Sampler
KY–1. Mandatory Federal Class I Area and IMPROVE Monitoring Site in Kentucky
KY–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Mammoth Cave IMPROVE Particulate Sampler
KY–3. Seasonal Deciview Averages from 1992–1998 for the Mammoth Cave IMPROVEParticulate Sampler
KY–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Mammoth Cave IMPROVE Particulate Sampler
KY–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Mammoth Cave IMPROVE Particulate Sampler
Spring Summer Autumn Winter
KY–6. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Mammoth Cave IMPROVE Particulate Sampler
ME–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Maine
ME–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Acadia IMPROVE Particulate Sampler
ME–3. Seasonal Deciview Averages from 1988–1998 for the Acadia IMPROVE Particulate Sampler
ME–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Acadia IMPROVE Particulate Sampler
ME–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Acadia IMPROVE Particulate Sampler
Spring Summer Autumn Winter
ME–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Acadia IMPROVE Particulate Sampler
MN–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Minnesota
MN–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Boundary Waters IMPROVE Particulate Sampler
MN–3. Seasonal Deciview Averages from 1992–1998 for the Boundary Waters IMPROVE Particulate Sampler
MN–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Boundary Waters IMPROVE Particulate Sampler
MN–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Boundary Waters IMPROVE Particulate Sampler
Spring Summer Autumn Winter
MN–6. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Boundary Waters IMPROVE Particulate Sampler
MT–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Montana
MT–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Glacier IMPROVE Particulate Sampler
MT–3. Seasonal Deciview Averages from 1988–1998 for the Glacier IMPROVE Particulate Sampler
MT–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Glacier IMPROVE Particulate Sampler
MT–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Glacier IMPROVE Particulate Sampler
Spring Summer Autumn Winter
MT–6. Contributions to Calculated Annual Aerosol Light Extinction From 1988–1998 for Glacier IMPROVE Particulate Sampler
NV–1. Mandatory Federal Class I Area and IMPROVE Monitoring Sites in Nevada
NV–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Jarbidge IMPROVE Particulate Sampler
NV–3. Seasonal Decivew Averages from 1988–1998 for the Jarbidge IMPROVEParticulate Sampler
NV–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Jarbidge IMPROVE Particulate Sampler
NV–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Jarbidge IMPROVE Particulate Sampler
Spring Summer Autumn Winter
NV–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Jarbidge IMPROVE Particulate Sampler
NJ–1. Mandatory Federal Class I Area and IMPROVE Monitoring Site in New Jersey
NJ–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Brigantine IMPROVE Particulate Sampler
NJ–3. Seasonal Deciview Averages from 1992–1998 for the Brigantine IMPROVE Particulate Sampler
NJ–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the the Brigantine IMPROVE Particulate Sampler
NJ–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Brigantine IMPROVE Particulate Sampler
Spring Summer Autumn Winter
NJ–6. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Brigantine IMPROVE Particulate Sampler
NM–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in New Mexico
NM–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Bandelier IMPROVE Particulate Sampler
NM–3. Seasonal Deciview Averages from 1988–1998 for the Bandelier IMPROVE Particulate Sampler
NM–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Bandelier IMPROVE Particulate Sampler
NM–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Bandelier IMPROVE Particulate Sampler
Spring Summer Autumn Winter
NM–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Bandelier IMPROVE Particulate Sampler
OR–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Oregon
OR–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Crater Lake IMPROVE Particulate Sampler
OR–3. Seasonal Deciview Averages from 1988–1998 for the Crater Lake IMPROVEParticulate Sampler
OR–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Crater Lake IMPROVE Particulate Sampler
OR–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Crater Lake IMPROVE Particulate Sampler
Spring Summer Autumn Winter
OR–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Crater Lake IMPROVE Particulate Sampler
OR–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Daysfrom 1994–1998 for the Three Sisters IMPROVE Particulate Sampler
OR–8. Seasonal Deciview Averages from 1994–1998 for the Three Sisters IMPROVEParticulate Sampler
OR–9. Contribution to Calculated Annual Light Extinction from 1994–1998 for the Three Sisters IMPROVE Particulate Sampler
OR–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Three Sisters IMPROVE Particulate Sampler
Spring Summer Autumn Winter
OR–11. Contributions to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Three Sisters IMPROVE Particulate Sampler
SD–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in South Dakota
SD–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Badlands IMPROVE Particulate Sampler
SD–3. Seasonal Deciview Averages from 1988–1998 for the Badlands IMPROVE Particulate Sampler
SD–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Badlands IMPROVE Particulate Sampler
SD–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Badlands IMPROVE Particulate Sampler
Spring Summer Autumn Winter
SD–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Badlands IMPROVE Particulate Sampler
TN–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Tennessee
TN–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Great Smoky Mountains IMPROVE Particulate Sampler
TN–3. Seasonal Deciview Averages from 1988–1998 for the Great Smoky MountainsIMPROVE Particulate Sampler
TN–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Great Smoky Mountains IMPROVE Particulate Sampler
TN–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Great Smoky Mountains IMPROVE Particulate Sampler
Spring Summer Autumn Winter
TN–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Great Smoky Mountains IMPROVE Particulate Sampler
TX–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Texas
TX–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Big Bend IMPROVE Particulate Sampler
TX–3. Seasonal Deciview Averages from 1988–1998 for the Big Bend IMPROVE Particulate Sampler
TX–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Big Bend IMPROVE Particulate Sampler
TX–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Big Bend IMPROVE Particulate Sampler
Spring Summer Autumn Winter
TX–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Big Bend IMPROVE Particulate Sampler
TX–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Guadalupe Mountains IMPROVE Particulate Sampler
TX–8. Seasonal Deciview Averages from 1988–1998 for the Guadalupe MountainsIMPROVE Particulate Sampler
TX–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Guadalupe Mountains IMPROVE Particulate Sampler
TX–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Guadalupe Mountains IMPROVE Particulate Sampler
Spring Summer Autumn Winter
TX–11. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Guadalupe Mountains IMPROVE Particulate Sampler
UT–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Utah
UT–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Bryce Canyon IMPROVE Particulate Sampler
UT–3. Seasonal Deciview Averages from 1988–1998 for the Bryce Canyon IMPROVEParticulate Sampler
UT–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Bryce Canyon IMPROVE Particulate Sampler
UT–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Bryce Canyon IMPROVE Particulate Sampler
Spring Summer Autumn Winter
UT–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Bryce Canyon IMPROVE Particulate Sampler
UT–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Canyonlands IMPROVE Particulate Sampler
UT–8. Seasonal Deciview Averages from 1988–1998 for the Canyonlands IMPROVEParticulate Sampler
UT–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Canyonlands IMPROVE Particulate Sampler
UT–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Canyonlands IMPROVE Particulate Sampler
Spring Summer Autumn Winter
UT–11. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Canyonlands IMPROVE Particulate Sampler
VT–1. Mandatory Federal Class I Area and IMPROVE Monitoring Site in Vermont
VT–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Lye Brook IMPROVE Particulate Sampler
VT–3. Seasonal Deciview Averages from 1992–1998 for the Lye Brook IMPROVE Particulate Sampler
VT–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Lye Brook IMPROVE Particulate Sampler
VT–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Lye Brook IMPROVE Particulate Sampler
Spring Summer Autumn Winter
VT–6. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Lye Brook IMPROVE Particulate Sampler
VA–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in Virginia
VA–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Shenandoah IMPROVE Particulate Sampler
VA–3. Seasonal Deciview Averages from 1988–1998 for the Shenandoah IMPROVEParticulate Sampler
VA–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Shenandoah IMPROVE Particulate Sampler
VA–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Shenandoah IMPROVE Particulate Sampler
Spring Summer Autumn Winter
VA–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Shenandoah IMPROVE Particulate Sampler
WA–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Washington
WA–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Mount Rainier IMPROVE Particulate Sampler
WA–3. Seasonal Deciview Averages from 1988–1998 for the Mount Rainier IMPROVEParticulate Sampler
WA–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Mount Rainier IMPROVE Particulate Sampler
WA–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Mount Rainier IMPROVE Particulate Sampler
Spring Summer Autumn Winter
WA–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Mount Rainier IMPROVE Particulate Sampler
WA–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1994–1998 for the Snoqualmie Pass IMPROVE Particulate Sampler
WA–8. Seasonal Deciview Averages from 1994–1998 for the Snoqualmie Pass IMPROVE Particulate Sampler
WA–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Snoqualmie Pass IMPROVE Particulate Sampler
WA–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Snoqualmie Pass IMPROVE Particulate Sampler
Spring Summer Autumn Winter
WA–11. Contributions to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Snoqualmie Pass IMPROVE Particulate Sampler
WV–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Site in West Virginia
WV–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1992–1998 for the Dolly Sods IMPROVE Particulate Sampler
WV–3. Seasonal Deciview Averages from 1992–1998 for the Dolly Sods IMPROVE Particulate Sampler
WV–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Dolly Sods IMPROVE Particulate Sampler
WV–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Dolly Sods IMPROVE Particulate Sampler
Spring Summer Autumn Winter
WV–6. Contributions to Calculated Annual Aerosol Light Extinction from 1992–1998 for the Dolly Sods IMPROVE Particulate Sampler
WY–1. Mandatory Federal Class I Areas and IMPROVE Monitoring Sites in Wyoming
WY–2. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Bridger IMPROVE Particulate Sampler
WY–3. Seasonal Deciview Averages from 1988–1998 for the Bridger IMPROVE Particulate Sampler
WY–4. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Bridger IMPROVE Particulate Sampler
WY–5. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Bridger IMPROVE Particulate Sampler
Spring Summer Autumn Winter
WY–6. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Bridger IMPROVE Particulate Sampler
WY–7. Yearly Deciview Averages for Most-Impaired, Mid-Range, and Least-Impaired Days from 1988–1998 for the Yellowstone IMPROVE Particulate Sampler
WY–8. Seasonal Deciview Averages from 1988–1998 for the Yellowstone IMPROVE Particulate Sampler
WY–9. Contribution to Calculated Annual Aerosol Light Extinction from 1994–1998 for the Yellowstone IMPROVE Particulate Sampler
WY–10. Contribution to Calculated Seasonal Aerosol Light Extinction from 1994–1998 for the Yellowstone IMPROVE Particulate Sampler
Spring Summer Autumn Winter
WY–11. Contributions to Calculated Annual Aerosol Light Extinction from 1988–1998 for the Yellowstone IMPROVE Particulate Sampler
3–1. Annual Average Visibility Indices for Least-Impaired Days from 1994–1998
3–2. IMPROVE Sites Showing Statistically Significant Trends in Visibility on Least-Impaired Days
3–3. Annual Average Visibility Indices for Mid-Range Days from 1994–1998
3–4. IMPROVE Sites Showing Statistically Significant Trends in Visibility on Mid-Range Days
3–5. Annual Average Visibility Indices for Most-Impaired Days from 1994–1998
3–6. IMPROVE Sites Showing Statistically Significant Trends in Visibility on Most-Impaired Days
3–7. Average Annual Sulfate PM Concentrations at IMPROVE Monitoring from 1994–1998
3–8. Average Annual Contributions of Sulfate PM to Total PM2.5 Levels at IMPROVE Monitoring Sites from 1994–1998
3–9. Average Annual Sulfate Extinction Coefficients at IMPROVE Monitoring Sites from 1994–1998
3–10. Average Annual Contributions of Sulfate PM to Calculated Aerosol Light Extinction at IMPROVE Monitoring Sites from 1994–1998
3–11. Average Annual Nitrate PM Concentrations at IMPROVE Monitoring Sites from 1994–1998
3–12. Average Annual Contributions of Nitrate PM to Total PM2.5 Levels at IMPROVE Monitoring Sites from 1994–1998
3–13. Average Annual Nitrate Extinction Coefficients at IMPROVE Monitoring Sites from 1994–1998
3–14. Average Annual Contributions of Nitrate PM to Calculated Aerosol Light Extinction at IMPROVE Monitoring Sites from 1994–1998
3–15. Level of Photosynthetic Activity in Vegetation during July 1988
3–16. Average Annual Organic Carbon PM Concentrations at IMPROVE Monitoring Sites from 1994–1998
3–17. Average Annual Contributions of Organic Carbon PM to Total PM2.5 Levels at IMPROVE Monitoring Sites from 1994–1998
3–18. Average Annual Organic Carbon Extinction Coefficients at IMPROVE Monitoring Sites from 1994–1998
3–19. Average Annual Contributions of Organic Carbon PM to Calculated Aerosol Light Extinction at IMPROVE Monitoring Sites from 1994–1998
3–20. Average Annual Elemental Carbon PM Concentrations at IMPROVE Monitoring Sites from 1994–1998
3–21. Average Annual Contributions of Elemental Carbon PM to Total PM2.5 Levels at IMPROVE Monitoring Sites from 1994–1998
3–22. Average Annual Elemental Carbon Extinction Coefficients at IMPROVE MonitoringSites from 1994–1998
3–23. Average Annual Contributions of Elemental Carbon PM to Calculated Aerosol Light Extinction at IMPROVE Monitoring Sites from 1994–1998
3–24. Average Annual Fine Soil PM Concentrations at IMPROVE Monitoring Sites from 1994–1998
3–25. Average Annual Contributions of Fine Soil PM to Total PM2.5 levels at IMPROVE Monitoring Sites from 1994–1998
3–26. Average Annual Crustal Material Extinction Coefficients at IMPROVE MonitoringSites from 1994–1998
3–27. Average Annual Contributions of Crustal Material PM to Calculated Aerosol Light Extinction at IMPROVE Monitoring Sites from 1994–1998
3–28. Mandatory Federal Class I Areas and IMPROVE Particulate Matter Samplers Divided into Western and Eastern Regions

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