‘Dark Rain’ Should No Longer Hit SP City This Sunday, Says Inmet | Saint Paul

With the fires in the Pantanal, which is experiencing its worst year of fires, the smoke reached São Paulo and mixed with the cloudiness. On Friday (18) and Saturday (19), the sky turned orange. The soot came not only from the Midwest, but also from fires that occur in the interior of the state, explained Alexandre Galvão, a meteorologist at Climatempo.

In addition to the arrival of oceanic winds, which bring humidity, a cold front from the south of the country also neutralizes the possibilities of ‘dark rain’ in the capital. This Sunday, the cold front reaches the south of the state, and the forecast is that it will arrive in the city of São Paulo this Monday (21).

This Sunday the forecast is cloudy sky with drizzle and light rain. The minimum is 17ºC and the maximum is 21ºC. This Monday the 21st, with the arrival of the cold front, the forecast is for heavy showers.

On August 19, 2019, the phenomenon of black rain occurred in the city of São Paulo due to the fires that occurred in the Amazon. Technical analyzes from two universities showed that dark-colored rainwater collected by residents of the capital contained particles from the burning. On social media, residents of Greater São Paulo posted images of dark rainwater.

The test carried out by the Institute of Chemistry of the University of São Paulo (USP) identified the presence of retention, a substance from biomass burning and considered a marker of burning, in the rainwater collected on Monday.

The examination carried out by the Municipal University of São Caetano (USCS) showed that the concentration of particulate matter, that is, soot, was seven times higher than that registered in normal rainwater.

While USP researchers looked at retention identification, which is a fire marker, the USCS analysis found 7 times the normal amount of soot and the presence of sulfides 10 times the average. The substance comes from the burning of fossil fuels and fires.