Improving NO(x) cap-and-trade system with adjoint-based emission exchange rates.
Cap-and-trade programs have proven to be effective instruments for achieving environmental goals while incurring minimum cost. The nature of the pollutant, however, affects the design of these programs. NO(x), an ozone precursor, is a nonuniformly mixed pollutant with a short atmospheric lifetime. NO(x) cap-and-trade programs in the U.S. are successful in reducing total NO(x) emissions but may result in suboptimal environmental performance because location-specific ozone formation potentials are neglected. In this paper, the current NO(x) cap-and-trade system is contrasted to a hypothetical NO(x) trading policy with sensitivity-based exchange rates. Location-specific exchange rates, calculated through adjoint sensitivity analysis, are combined with constrained optimization for prediction of NO(x) emissions trading behavior and post-trade ozone concentrations. The current and proposed policies are examined in a case study for 218 coal-fired power plants that participated in the NO(x) Budget Trading Program in 2007. We find that better environmental performance at negligibly higher system-wide abatement cost can be achieved through inclusion of emission exchange rates. Exposure-based exchange rates result in better environmental performance than those based on concentrations.
Department of Civil and Environmental Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario, Canada.
S Morteza
SM
Mesbah
Amir
A
Hakami
Stephan
S
Schott
D000393:Air Pollutants / Q000032:analysis; D000397:Air Pollution / Q000191:economics / Q000331:legislation & jurisprudence / Q000517:prevention & control; D003031:Coal; D003198:Computer Simulation; D003661:Decision Support Techniques; D058735:Environmental Policy / Q000191:economics; D008962:Models, Theoretical; D009589:Nitrogen Oxides / Q000191:economics; D010126:Ozone / Q000032:analysis; D011210:Power Plants / Q000191:economics / Q000331:legislation & jurisprudence*; D014481:United States
D000393:Air Pollutants; D003031:Coal; D009589:Nitrogen Oxides; D010126:Ozone