It’s important to take precautions when operating a generator because they produce carbon monoxide gas. Breathing in too much carbon monoxide could cause fainting or death. According to the CDC, more than 20,000 Americans visit the emergency room and more than 400 die from unintentional carbon monoxide poisoning each year. Symptoms of carbon monoxide poisoning are often flu-like and include: Headache Dizziness Weakness Nausea Vomiting Chest pain Confusion