Brazil deploys 300 firefighters as a surge in fires worsens air pollution in Manaus and investigators probe suspected organized arson.
Brazil has launched joint operations to track down those suspected of deliberately setting fires in the Amazon rainforest, as a sharp rise in blazes blankets Manaus with toxic smoke and pushes air pollution to critical levels for the city’s 2.3 million residents.
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Authorities suspect an organized network is deliberately destroying native vegetation in preserved forest areas to facilitate the illegal seizure of public land, Environment Minister João Paulo Capobianco said at a news conference Wednesday. Investigators are working to identify and prosecute both those who set the fires and those suspected of directing them.
Capobianco described the situation as an “impressive display of deliberate action.” He and Jair Schmitt, head of Brazil’s environmental protection agency Ibama, cited reports of people throwing fuel-filled bottles from moving vehicles along roads and repeatedly reigniting fires in areas where firefighters had already extinguished them.
The scale of the fires has escalated sharply. Amazonas state recorded 1,608 fire hotspots in the first part of October, already exceeding the 874 registered throughout October 2025, according to Brazil’s National Institute for Space Research (INPE).
September saw more than 3,700 hotspots, four times the number recorded a year earlier. Fires burned 291,060 hectares that month, 38.8% above the historical average, according to official data.
In October, the area affected has approached 220,700 hectares, 249% above the usual level, according to the Federal University of Rio de Janeiro’s Laboratory for Environmental Satellite Applications.
The government has deployed 11 aircraft and approximately 300 firefighters to the hardest-hit areas. Difficult terrain and adverse weather conditions have complicated efforts to contain the blazes. Authorities have also warned that extreme drought and high temperatures associated with El Niño are accelerating the spread of fires across northern Brazil.
Smoke from fires in Amazonas and Pará states has engulfed Manaus, where air quality has deteriorated to critical levels. Concentrations of fine particulate matter known as PM2.5 have exceeded the maximum levels recommended by the World Health Organization, increasing the risk of acute respiratory problems, particularly among children, older people and those with pre-existing medical conditions.
The Civil Police of Amazonas has opened 120 investigative proceedings into suspected environmental offenses. Investigators are using thermal drones and conducting continuous ground patrols to gather evidence and identify those responsible.
The investigations come as Brazil prepares for a presidential runoff on Oct. 25 between incumbent Luiz Inácio Lula da Silva and opposition senator Flávio Bolsonaro, who received the most votes in the first round. Asked whether the fires could be politically motivated to undermine Lula’s candidacy, Capobianco said investigators were examining that possibility but stressed that the theory had yet to be substantiated.
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