In 2008 "almost 100 thousand hectares of grasslands are burning in the Paraná Delta, Entre Ríos and Santa Fe, generating a dense cloud of smoke that is carried by the wind and has engulfed the city of Buenos Aires and the south of the province. The smoke has also affected the cities of southern Uruguay, covering the riverside city of Colonia, as well as Montevideo and Punta del Este, and even Rocha, on the border with Brazil." (Quoted from the article)