Anthony and Hailey set up a darkroom in their basement. They were developing several rolls of film when Anthony began to feel ill. He became achy and agitated and thought that he was coming down with the flu. Soon, Hailey began to feel ill as well. Hailey has asthma, so when she felt like she was having difficulty breathing. She insisted they leave the room. What must have happened in the darkroom? Discuss about the hazard and the procedures to treat Anthony and Hailey.