A number of social media users circulated pictures of lumps of duts suspended in the air, currently moving to different parts of the country.
Although will last until the last week, the heavy fog is expected to remarkably relent on Wednesday and Thursday, while on rainfall is forecast.
Gremio repeated their victory over Lanus in the first leg in Brazil, securing their third title in the tournament.
Despite losing 1-0 in the first leg in Brazil, the Lanus players had a great performance and were the better side.
Photovoltaic cells convert sunlight directly into electricity.