At 18:15 hours, the WRFD was dispatched to 83 Wesmont Drive for an activated carbon monoxide detector. Firefighters arrived and recorded 65 ppm of carbon monoxide in the residence and 40 ppm of CO in the garage on their meters. The house was vented and CO levels were reduced to zero. There were no injuries reported. The source of the CO was determined to be an idling vehicle. All WR units were back in service at 19:33 hours.