 Though symptoms of overexposure can begin within 2 days of exposure, typically long-term exposure is more harmful.In 2008, the U.S. CDC recommended that use of 1-bromopropane as a replacement for perchloroethylene may require adjustment and modification of equipment, improved ventilation, and use of personal protective equipment.In 2013, a peer-review panel convened by the U.S. National Toxicology Program unanimously recommended that 1-bromopropane, be classified as reasonably anticipated human carcinogens.