NOX Emission Controls for Heavy-Duty Vehicles Toward Meeting a 1986 Standard (1981) / Chapter Skim
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'INTRODUCTION'
'INTRODUCTION'
Pages 1-20
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(The U.S. Environmental Protection Agency (EPA)
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. Associated with this emissions level are new definitions of useful life and new enforcement audit requirements, described in a later section of this chapter, "Regulatory Options Under the Clean Air Act." This committee has investigated the available technology for reducing the NOX emissions of heavy-duty vehicles, has evaluated the technological feasibility of meeting various possible NOX standards, and has assessed the corresponding impacts on fuel economy, costs, and emissions of other species.
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Table 2, taken from the EPA draft regulatory analysis, (U.S. Environmental Protection Agency, l980a)
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^ NO rH CJ i-t rH Cd CO OT co O O o o >-, MOO k i M • •> O Cd CO ^f CJ CJ v^ ^ c0 to H CM I ^v 01 rH O CO CO O O i M u~> O •H cd • • O rH 00 O rn CJ N_^ r-( M (^ Cd • 01 < SH CO O 00 ON I !
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Environmental Protection Agency, l98lb) plans to defer enforcement audits two years and to relax the AQL requirement to 40 percent.)
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At the time of this report, EPA is revising all these standards, and changing the l0-percent AQL requirement back to 40 percent (U.S. Environmental Protection Agency, l98lb)
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4-1 (X •O Ed 01 (X •H M •^ cd •a M M rH O I i 01 nt PM I 1 0 o •a H W rH rH 4J c £= a CO 01 M T3 £> ca •H ft fl •a CO CO • 01 M i CO CO a O c o ot •o CO 00 c 4J O
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The l984 hydrocarbon and carbon monoxide standards are currently undergoing revision (U.S. Environmental Protection Agency, l98lb)
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> T PQ g o 0 |
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U.S. Environmental Protection Agency (1981b)
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Units are g/bhp-h unless otherwise noted. ''Optional standard of 25 g/bhp-h for carbon monoxide and 5 g/bhp-h for the sum of hydrocarbons and NOx are available for 1977-1983 in California and 1979-1983 federally.
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This is because controls on emissions from light-duty vehicles and stationary sources are more stringent in these regions than in the nation as a whole. Without further NOx emissions standards for heavy-duty vehicles, heavy-duty vehicles are predicted to contribute 24 percent of the total NOX inventory in the South Coast Air Basin by l987.
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(2l8) Total motor vehicles 830 60 622 54 Total all sources l,380 l00 l,l58 l00 Bay Area Air Quality Management District Heavy-duty vehicles: l26 l6 l39 l9 Gasoline (32)
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For example, in regions where heavy-duty engines make a significant contribution to overall NOX emissions, a significant reduction in the atmospheric burden of species formed from these emissions would be associated with reductions of heavyduty NOX emissions. In evaluating the significance of these numbers it is important to consider the reduction in urban NOX emissions required to attain and maintain air quality standards.
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Environmental Protection Agency, l98la)
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l980a. "Draft Regulatory Analysis, Environmental Impact Statement and NOX Pollutant Specific Study for Proposed Gaseous Emission Regulations for l985 and Later Model Year Light-Duty Trucks and l986 and Later Model Year Heavy-Duty Engines." Office of Mobile Source Air Pollution Control.
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