Answer: 
The statement that says that the city’s air is clean is not true about Buenos Aires.
Step-by-step explanation: 
- Buenos Aires is both, the largest city by population and the capital of Argentina. 
- The city is partially industrialized and has been experiencing poor air quality since the last couple of decades. 
- The reason behind the deterioration of the air quality can be said to be rapid deforestation, rapid population growth, rapid industrialization, and vehicular emissions.