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The Colorado Department of Health (CDH) collected CO exhaust emissions data from twenty-one vehicles using three “short” emissions tests, and the Federal Test Procedure (FTP). CO data were also collected from these vehicles using a remote sensing system. Excess carbon monoxide emissions were calculated from the difference between FTP measurements and federal standards. Emissions were then categorized by individual vehicle and by vehicle type. Errors of comission and omission were determined for each of the short tests and remote sensing system. The CDH226 showed the highest correlation for identifying vehicles emitting excessive CO. Compared to the FTP, it identified the vehicles responsible for 98.5% of all excess emissions. All the “short” tests and remote sensing tests identified the vehicles producing the majority of excess emissions. The current BAR '84 type idle “short” test and the CDH226 demonstrated the lowest errors of comission, or false failures.

The winter of 1988-89 marked the second program year of the Colorado Oxygenated Fuels Program. As part of that program, the Colorado Department of Health (CDH) conducted a study to determine the environmental and economic impacts of the use of oxygenated fuels. For use in that study, the U.S. EPA contracted for a cost analysis of the program which was conducted by RCG/Hagler Bailly, Inc. The CDH study, with the assistance of the EPA contract study, looked at the air quality benefit and exhaust emission reductions, economic cost, market distribution of available oxygenated fuels, and public education and enforcement activities for the Oxygenated Fuels Program. The findings of this study were previously released in the report, “1988-89 Oxygenated Fuels Program - Air Pollution Control Division Final Report to the Colorado Air Quality Control Commission” (AQCC).