08_Air_Lecture_BB (1).ppt - Air Quality Presented by Dr...

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© 2003, 2011 by H. Troy Stuckey, Ph.D. . Air Quality Presented by Dr. Troy Stuckey to PP 3310, PLSC 3333
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . Urban-Industrial Haze Plumes Southeast Texas June 11, 1997 - Visual Satellite Image Source: TCEQ
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . Southeast Texas June 11, 1997 - Enhanced Visual Satellite Image Source: TCEQ
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . Lecture Overview Clean Air Regulations Ozone Ozone Attainment, SIPs, and Science Local Clean Air Plans Public Health and the “AQI”
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . Evolution of Federal Clean Air Laws 1955 - Air Pollution Control Act 1963 - Clean Air Act, Public Health Service 1967 - Air Quality Act 1970 - EPA created, Permitting Program, State Implementation Plans (SIPs), National Ambient Air Quality Standards (NAAQS) 1972 - Ozone NAAQS (0.08 ppm), Total Suspended Particulate (150 micrograms) 1977 - Strengthens Mobile Source, Prevention of Significant Deterioration, Nonattainment Areas Required 1979 - Ozone NAAQS Changed to 0.12 ppm 1987 - Total Particulate NAAQS Changed to 10 Microns (PM-10) 1990 - Amendments Implement Rate of Progress And New Classification System 2001 - Supreme Court Upholds EPA’s authority to implement new rules: 8-hour ozone standard (0.08 ppm) ; fine particulates (PM-2.5) 2008 – EPA promulgates new 8-hour ozone standard (0.075 ppm)
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . According to the Clean Air Act (1990) 1990-Collin, Dallas, Denton, Tarrant Counties (DFW) Area classified as “moderate” nonattainment area. 1992-State Implementation Plan (SIP) submitted to Environmental Protection Agency showing attainment of ozone standard by 1996. 1996-The standard was not reached. March 1998, the 4-county area was reclassified by EPA as a “serious” nonattainment area. April 2000 - A new SIP was submitted to EPA, showing attainment by 2007 with earliest possible implementation of control measures. 2004, EPA designated 9 counties as nonattainment for the 8-hour ozone standard. 1-hour standard remains.
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . How did we get into this mess? The region violated the National Ambient Air Quality Standard for ozone
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . What are the National Ambient Air Quality Standards (NAAQS)? Federal standards to protect public health Specified in the Clean Air Act for 6 criteria pollutants: Particulates Sulfur Dioxide Carbon Monoxide Lead Nitrogen Oxide Ozone Environmental Protection Agency designates areas attainment or nonattainment based on whether they meet NAAQS Dallas/Fort Worth is attainment for 5 of the 6, but nonattainment for ozone
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© 2003, 2011 by H. Troy Stuckey, Ph.D. . What is Ozone? Ozone is O 3 Location is everything Good up there (15 miles +) Stratospheric ozone shields earth from ultraviolet rays of the sun (prevents skin cancer and cataracts) Bad down here (less than 12 to 6 miles from surface) Produced in Nature: lightning, pine trees Excess comes from chemical reactions burning of fossil fuels, coal, as well as from vapors of solvents, paints, etc.
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© 2003, 2011 by H. Troy Stuckey, Ph.D.
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