Last paragraph: To the sentence and in many cases they demonstrate independent corroboration of many of the lessons learned from modeling replace with and provide a good indication of the inherent strength and weakness in photochemical grid modeling. Last Sentence: add after episodes and potentialIt is clear that because of the uncertainties in the modeling and associated data bases that development and commitment to a management process (Demerjian, 1995) that the results in continuous measurable progress towards attainment is the most prudent course.
