Carbon monoxide, ammonia, hydrogen sulfide, and phosphine are all combustible and toxic gases
Carbon monoxide is colorless and odorless, forming a primary component of coal gas. Ammonia, also colorless, is characterized by its pungent smell. Hydrogen sulfide, despite being colorless, emits an odor akin to rotten eggs and is utilized in synthesizing fluorescent powders and photoconductors. Phosphine, another colorless gas, has a fish-like odor and serves as an initiator and catalyst in polymerization reactions.
