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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.