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The overall objective of this study was to measure the air pollutant concentrations inside and outside of diesel truck cabs under conditions of extended idling at a truck stop. The measurements were conducted under different modes of engine and air conditioner operation at different times of day and night. One-hour average concentrations of fine particulate matter, nitrogen oxides, and carbon monoxide were measured. All trucks showed some level of self-contamination of in-cab air quality from engine emissions during idling. Some trucks showed significantly higher in-cab concentrations than outside concentrations, indicating engine compartment leaks into the cab. Other trucks showed in-cab concentrations similar to or even lower than outside concentrations but showed higher outside and in-cab concentrations during engine idling than when the engine was turned off. In these cases, truck emissions raised the …