"TEHRAN AIR" is a phrase often used to refer to the air quality of Tehran, the capital city of Iran. Synonyms for this term could include "Tehran's atmospheric condition", "Tehran's air pollution", or simply "air quality in Tehran". These alternatives help to convey the same idea of discussing the air situation in Tehran without specifically using the phrase "TEHRAN AIR". It is important to address concerns regarding this topic due to Tehran's known issues with air pollution and the potential health hazards it poses to its residents. Monitoring and improving Tehran's air quality should remain a crucial priority for the city's authorities.