Optimizing the mix of strategies for control of vehicular emissions

Raul P. Lejano, Pacita M. Ayala, Erlinda A. Gonzales

Research output: Contribution to journalArticlepeer-review


A number of strategies for the control of vehicular emissions are being considered by the Philippine government to address Metropolitan Manila's air quality problem. An analytical tool is needed for optimizing criteria pollutant reductions given the budgetary constraints. The simplest approach is to take costs and pollutant removals to be linear with each strategy's scale of activity, and this is readily solved as a linear programming problem. Another approach is to use a dynamic system of weights which shift with progressive improvements in pollutant emissions. The two approaches yield somewhat different results, suggesting the sensitivity of the solution to the assumed weights. The study also illustrates the importance of a sound methodology for evaluating priorities given to different air quality goals. One such methodology may involve a polling of expert panels and the public to gain insight into the relative importance given to competing emissions reduction goals. An informal polling of resource agency staff was conducted and discussed in this paper. The authors take the position that proper planning involves tracing intermediate steps to the final outcome and not just focusing on the latter.

Original languageEnglish (US)
Pages (from-to)79-87
Number of pages9
JournalEnvironmental Management
Issue number1
StatePublished - Jan 1997


  • Emissions control
  • Environmental systems analysis
  • Manila
  • Optimization
  • Urban air quality
  • Vehicular emissions

ASJC Scopus subject areas

  • Global and Planetary Change
  • Ecology
  • Pollution


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