The phenomenon of ‘black rain’ results from the arrival in São Paulo of the smoke from burning in the Pantanal that joins the high load of atmospheric pollution produced in the city.
According to researchers, although the accumulation of particulate material in the air increases health risks and can cause respiratory problems, the rain itself has a greater potential to pollute rivers and water sources – without major impacts on people, houses or vehicles.
Fires send soot and particulate matter into the atmosphere, which are very fine particles of solids or liquids that are suspended in the air, in addition to gases such as monoxide (CO) and carbon dioxide (CO2). Air currents, however, drag smoke from the fires, today mainly in Mato Grosso and Mato Grosso do Sul, to other regions.
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