Did you know that according to the International Center for Technology Assessment (CTA), exposure to most car pollutants, like carbon monoxide (CO), is much higher INSIDE idling vehicles than on the road side. Higher exposure occurs when sitting in traffic congestion, highways, or in a line-up of idling vehicles at a school or drive-thru. In these situations, CO levels inside your vehicle can be 7 times the outside air level! *ITCA Energy policy. Let’s make Roeper a No-Idle School. When in your car for more than 30 seconds, please consider turning off the engine.