Carbon monoxide alarms for homes have been around for several years and now a version for cars is being test-marketed in Iowa and Colorado. The alarms warn of the odorless, colorless gas that can be deadly if not detected. Iowa State University Ag Engineer Thomas Greiner is considered an expert on carbon monoxide. He says studies show 100 people nationwide have died in their cars from C-O poisoning. Greiner says cars in disrepair hold the most risk for carbon monoxide poisoning. He says if your car isn’t tuned up and has holes in the body, you should be careful.He says you can reduce your risk by keeping your car tuned, and the muffler in good shape.Since the carbon monoxide alarms are so new, Griener says there aren’t any standards to measure their effectiveness. He has this advice if you do decide to choose an alarm for your car. He suggests you find a company that has been successful in making the home version of the carbon monoxide alarm. Greiner expects the carbon monoxide alarms for cars to become widely available in the near future.