Protecting Visibility in National Parks and Wilderness Areas

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Protecting Visibility in National Parks and Wilderness Areas (1993)
Commission on Geosciences, Environment and Resources (CGER)

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. "6 Emission Controls and Visibility." Protecting Visibility in National Parks and Wilderness Areas. Washington, DC: The National Academies Press, 1993.

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Protecting Visibility in National Parks and Wilderness Areas

TABLE 6-2 Percentage Contribution of Source Categories to Emissions in the East, Southwest, and Nortwest^a^,^b^,^c

	SO_x	Organic Particles	VOCs	Elemental Carbon^c	Suspended Dust	NH₃	NO_x
East
Electric utilities (nearly all from coal-fired power plants)	78	Neg	Neg	Neg	Neg	Neg	39
Diesel-fueled mobile sources (trucks, buses, train, jets, ships, heavy equipment)	1 1/2 1	Neg 34	Neg 31	47 29	Neg^d Neg^d	Neg Neg	16 26
Gasoline vehicles
Petroleum and chemical industries and industrial oil combustion	4 1/2 7	Neg Neg	11 Neg	Neg Neg	Neg Neg	Neg Neg	Neg Neg
Industrial coal combustion	Neg	20	13	15	Neg	Neg	Neg
Residential wood burning
Fugitive dust (presumably predominantly from on-road and off-road traffic)	Neg Neg	Neg Neg	Neg Neg	Neg Neg	100 Neg	Neg 66	Neg Neg
Feedlots and livestock waste management	8	46	45	9	Neg	34	19
Miscellaneous