I work in a chemical plant that we used to make phosgene. Mixed CO gas and chlorine gas. worked around it for 11 years in production and 15 years in maintance. No one in our plant ever died from exposure but a few spent a couple of days in the hospital. My first day of oreintaion said that phosgene smelled like new mowed hay. Well smelt it quite a few times and it didn't smell like hay!!!You Know that's what Hitler called mustard gas.......