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. I-" -1 ..~ 1'\) The kaowledge of the visibility problem in Colorado appears on the surface to be considerable. However, this appearance is somewhat misleading. A number of activities are proceeding that address portions of the visibility question. There is a need to identify the commonalities and divergences each activity has with tbe ongoing studies. Once this is complete, a more comprehensive picture of the issues surrounding visibility will emerge. Milestones Responsibility Completion Date Comprehensive review of current status CDH/EPA of existing studies including expectations and establishing an agreed-to-series of expectations for current and upcoming studies. July, 1982 Study to establish emission factors for CDH diesels at high altitude. December, 1982 Establish continously operating CDH visibility monitor. Unknown Completion of Brown Cloud Study. EPA/CDH Spring, 1983 Sub-Objective Two: Reduce emissions in nonattainment areas so as to make reasoaable progress towards attaining standards by statutory deadlines. Ratioaale: The Clean Air Act Amendments of 1977 requires States to develop a State Implementation Plan (SIP) for air quality to meet ambient health standards by 1982 or where applicable, 1987. In all nonattainment areas of the States, plans have been jointly developed by the State and local/regional governments to meet these standards. State statute (C.R.S. 25-7-102, et. seq.) provides for the incorporation of locally developed air quality plans into the State plan. Thus, the State will be required to focus intensive effort on implementation of measures that are not the direct responsibility of the State to ensure that commitments made in the plans are carried out. Also, control programs that are the direct responsibility of the State such as the Automotive Inspection and Readjustment (AIR) Program and the volatile organic compound (VOC) control program will continue to be implemented as part of the State's plan to meet health standards. The analyses performed in various areas of the State have indicated that: 1) mobile sources emissions contribute significantly to the monitored violations of health standards; 2) the programs implemented will require intensive coordination on the part of many agencies; 3) the auto inspection program and the VOC control program are both cost-effective measures to reduce emissioas and; 4) there is a need to define additional measures to meet clean air standards in metropolitan Denver. . -27- )