Regional Haze Analysis - Express Tools

Haze is caused when sunlight encounters tiny pollution particles in the air. Some light is absorbed by particles. Other light is scattered away before it reaches an observer. More pollutants mean more absorption and scattering of light, which reduce the clarity and color of what we see. Some types of particles such as sulfates scatter more light, particularly during humid conditions. The U.S. Environmental Protection Agency and other federal agencies have been monitoring visibility in national parks and wilderness areas since 1988. In 1999, the EPA announced a major effort to improve air quality in national parks and wilderness areas. The Regional Haze Rule calls for state and federal agencies to work together to improve visibility in 156 national parks and wilderness areas.

The tools below have been designed to help visualize trends and composition for the primary components of aerosol light extinction (haze) in order to support the technical planning and analysis needs of air quality researchers and especially the States and Tribes that are required to periodically submit implementation plans for reducing regional haze in protected ecosystems.

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Charts
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1 Haze Trends Summary
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2 Haze Trends by Group
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3 URP Glidepath
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4 Annual Comparison of Monthly Averages
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5 Haze Composition Summary
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6 5-Year Baseline Average Haze Composition
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7 Annual 5-Year Average Haze Composition
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8 Annual Average Haze Composition
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9 Seasonal Average Haze Composition
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10 Monthly Average Haze Composition
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11 Total Average Haze Composition vs Endpoints
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12 Total Average Haze Composition
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13 Daily Haze Composition Summary
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14 RHR2 Daily Extinction Budgets
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15 RHR3 (Impairment) Daily Extinction Budgets
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16 RHR Yearly Group Days Extinction Budgets
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17 IMPROVE Daily Fine Mass Budgets
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18 IMPROVE Daily Total Mass Budgets
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19 Haze Distribution Summary
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20 Trends in Distribution of Aerosol Haze
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21 Histogram of Haze Values
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22 Number of Haze Group Days by Month
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23 Anthro vs. Natural — Annual M.I.D.
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24 Anthropogenic Haze Composition — Annual
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25 Natural Haze Composition — Annual
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26 Total Haze Composition — Annual
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27 Anthro vs. Natural — Daily M.I.D.
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28 Anthropogenic Haze Composition — Daily
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29 Natural Haze Composition — Daily
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30 Total Haze Composition — Daily
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Maps
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31 U.S. Light Extinction Composition
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32 U.S. Fine Mass Composition
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Tables
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33 State Deciview Trends, all CIAs
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34 State Extinction Trends, per CIA
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