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Department of Environmental Quality
Trajectory Analyses of Class I areas in the Central and Western U.S. on 20% Worst Days Between 2011 and 2016 Department of Environmental Quality
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Purpose & Methodology Performed back trajectories on active Class I sites in the western portion of the VISTAS domain. Purpose: Determine if these sites need to be analyzed further in work to complete Regional Haze SIPs among the VISTAS states. Methodology: 72-hour back trajectories ending at 10, 100, 300, 500, 750, 1000, 1500 and 2000 meters AGL. Using NAM 12km data. Looked at 20% worst days from 2011 to 2016. Data from IMPROVE website.
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Texas
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Oklahoma
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Kansas
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Nebraska
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South Dakota
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North Dakota
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Minnesota
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Montana
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Wyoming
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Colorado
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New Mexico
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Conclusions Sites in the following states do not need to be modeled or have Q/d analysis done: Colorado Wyoming Montana North Dakota South Dakota Nebraska Sites in the following states may need to be modeled or have Q/d analysis done: Texas Oklahoma Kansas Minnesota New Mexico
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