List of Figures

The following list indicates the titles of the figures used in the National Air Quality and Emissions Trends Report.

• Figure 1-1. Summary of emissions changes for all six NAAQS pollutants between 1970 and 1995.
• Figure 1-2. Total U.S. population, 1970-1995.
• Figure 1-3. Total U.S. vehicle miles traveled, 1970-1995.
• Figure 1-4. Total U.S. gross domestic product, 1970-1995.
• Figure 1-5. Number of people living in counties with air quality levels above the NAAQS in 1995.
• Figure 2-1. Trend in second maximum non-overlapping 8-hour average CO concentrations, 1986-1995.
• Figure 2-2. National total CO emissions trend, 1986-1995.
• Figure 2-3. CO emissions by source category, 1995.
• Figure 2-4. CO second maximum 8-hour concentration trends by location, 1986-1995.
• Figure 2-5. Highest CO second maximum 8-hour concentration by county, 1995.
• Figure 2-6. Long-term ambient CO trend, 1976-1995.
• Figure 2-7. Trend in maximum quarterly average Pb concentrations, 1986-1995.
• Figure 2-8. National total Pb emissions trend, 1986-1995.
• Figure 2-9. Pb maximum quarterly mean concentration trends by location, 1986-1995.
• Figure 2-10. Long-term ambient Pb trend, 1976-1995.
• Figure 2-11. Pb emissions by source category, 1995.
• Figure 2-12. Pb maximum quarterly concentration in the vicinity of Pb point sources, 1995.
• Figure 2-13. Highest Pb maximum quarterly mean concentration by county, 1995.
• Figure 2-14. Trend in annual NO₂ concentrations, 1986-1995.
• Figure 2-15. National total NOx emissions trend, 1986-1995.
• Figure 2-16. NOx emissions by source category, 1995.
• Figure 2-17. NO₂ annual mean concentration trends by location, 1986-1995.
• Figure 2-18. Highest NO₂ annual mean concentration by county, 1995.
• Figure 2-19. Trend in annual second daily maximum 1-hour O₃ concentrations, 1986-1995.
• Figure 2-20. O₃ second daily maximum 1-hour concentration trends by location, 1986-1995.
• Figure 2-21. O₃ meteorologically-adjusted trend.
• Figure 2-22. Highest O₃ second daily maximum concentration by county, 1995.
• Figure 2-23. Long-term ambient O₃ trend, 1976-1995.
• Figure 2-24. National total VOC emissions trend, 1986-1995.
• Figure 2-25. VOC emissions by source category, 1995.
• Figure 2-26. Trend in annual mean PM-10 concentrations, 1988-1995.
• Figure 2-27. National total PM-10 emissions trend, 1988-1995 (traditionally inventoried sources only).
• Figure 2-28. PM-10 annual mean concentration trends by location, 1988-1995.
• Figure 2-29. PM-10 emissions from traditionally inventoried source categories, 1995.
• Figure 2-30. PM-10 total emissions by source category, 1995.
• Figure 2-31. Highest second maximum 24-hour PM-10 concentration by county, 1995.
• Figure 2-32. Highest second maximum 24-hour SO₂ concentration by county, 1995.
• Figure 2-33. Trend in annual mean SO₂ concentrations, 1986-1995.
• Figure 2-34. National total SO₂ emissions trend, 1986-1995.
• Figure 2-35. SO₂ total emissions by source category, 1995.
• Figure 2-36. SO₂ annual mean concentration trends by location, 1986-1995.
• Figure 2-37. Long-term ambient SO₂ trend, 1976-1995.
• Figure 2-38. Trend of haze from airport visual data (July-September).
• Figure 2-39. Annual average light extinction, 1992-1995 IMPROVE data.
• Figure 2-40. Annual average visibility impairment in deciviews, 1992-1995 IMPROVE data.
• Figure 2-41. Shenandoah National Park on clear and hazy days, and the effect of adding 10 ug/m3 fine particles to each.
• Figure 3-1. PAMS 1994-1995 changes in benzene levels compared to California benzene trend (CARB).
• Figure 4-1. HAP emissions by source category, 1990.
• Figure 4-2. HAP emissions by state, 1990.
• Figure 4-3. MACT source categories.
• Figure 4-4. Emissions reductions, >5000 tons per year.
• Figure 4-5. Emissions reductions, <5000 tons per year.
• Figure 5-1. Location of nonattainment areas for criteria pollutants.
• Figure 5-2. O₃ nonattainment areas by degree of severity.
• Figure 6-1. Number of days with psi values > 100, 1986-1995.
• Figure B-1. CO monitoring network, 1995.
• Figure B-2. Pb monitoring network, 1995.
• Figure B-3. NO₂ monitoring network, 1995.
• Figure B-4. O₃ monitoring network, 1995.
• Figure B-5. PM-10 monitoring network, 1995.
• Figure B-6. SO₂ monitoring network, 1995.