Buenos Aires may mean fair winds in English, but smoke from burning scrubland has blown over the capital.
The government has blamed farmers for illegally starting fires to clear land for grazing.
The smoke has caused traffics chaos, forcing roads to be closed and flights to be cancelled.
The smoke is also causing breathing problems and people have sought medical treatment for eye problems.
Firefighters are tackling 70,000 hectares of land that is burning to the north of the capital.
President Cristina Fernandez has urged the authorities to prosecute those responsible for the fires.
This satellite image shows the clouds of smoke that were heading towards Buenos Aires on Wednesday. The problem has now drifted to neighbouring Uruguay, with smoke hanging over Montevideo.