Motor vehicles are the main source of carbon monoxide (CO). Under multiple sponsorship, two major vehicle emissions studies were conducted: one in Fort McHenry tunnel (under the Baltimore Harbor) in June 1992 and the other in the Tuscarora Mountain tunnel in south-central Pennsylvania (Pennsylvania Turnpike) in September 1992. The cars at both sites tended to be newer than elsewhere (median age was < 4 years), and much better maintained as judged by low CO/CO2 ratios and other emissions characteristics. Measured CO/CO2 ratios agreed with concurrent roadside infrared remote sensing measurements on light-duty vehicles. Remote sensing measurements on heavy-duty diesels were obtained for the first time and were roughly in agreement with the regular (bag sampling) tunnel measurements in both CO/CO2 and HC/CO2 ratios.


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    Summary of Recent Tunnel Studies in the Fort McHenry and Tuscarora Mountain Tunnels

    Gertler, A. / Coordinating Research Council | British Library Conference Proceedings | 1994


    Remote Sensing of Real-World Automotive Emissions Evaluation of the Methodology in Highway Tunnels

    Bishop, G. / Coordinating Research Council | British Library Conference Proceedings | 1994



    Real-World Automotive Emissions - What Can We Learn From Tunnel Studies?

    Gertler, A. W. / Pierson, W. R. / Zielinska, B. et al. | British Library Conference Proceedings | 1993


    USS Tuscarora and United States Naval Oceanography in the Post-Civil War Era

    Fornshell, John A. | Taylor & Francis Verlag | 2025