The word "烟雾" is formed by combining two individual characters, each representing a distinct natural phenomenon: "烟" meaning "smoke", typically arising from fire or combustion, and "雾" meaning "fog" or "mist", associated with atmospheric moisture. Together, they create a compound word that conceptually blends these elements to depict a hybrid or intertwined state, such as the hazy mixture known as "smog". This formation follows a common pattern in Chinese where semantically related characters are joined to convey a unified or enhanced meaning, in this case evoking the visual and environmental concept where smoke and fog intermingle.