Satellite data reveal a sharp rise in fire activity across the central and eastern Amazon as the 2026 El Niño event intensifies drought conditions. NASA Earth Observatory imagery captured dense smoke drifting over Manaus on October 12, 2026, when air quality monitors recorded PM2.5 levels exceeding 135 micrograms per cubic meter—placing the city among the world's most polluted urban centers that day. Local officials responded by closing schools and suspending public events for over two million residents amid hazardous air conditions.

Scientists tracking the regional fire cascade note that drought patterns originating in equatorial Asia precede heightened fire activity in South America by several months. Douglas Morton, an Earth system scientist at NASA Goddard Space Flight Center, explained that the current sequence mirrors the 2015-2016 El Niño event documented in prior research. "We're seeing the second domino fall in the tropics fire cascade," Morton stated, describing how drought-fueled fires in Indonesia have now progressed to the Amazon basin.

The affected zone spans from forests near Manaus and Santarém to the Amazon River's mouth. Analysis by University of Maryland researcher Shane Coffield indicates approximately 50 to 70 uncontrolled fires are burning in the Santarém region alone, with additional outbreaks reported across Pará state. Independent satellite verification suggests official fire detection systems may undercount actual incidents due to dense smoke, cloud cover, and canopy obstruction that hinder infrared sensor visibility, particularly for lower-intensity understory fires.

Brazil's National Institute of Meteorology reported rainfall in Manaus was 95 percent below normal for August and 60 percent below average in September 2026. Under these conditions, most fires originated as agricultural management burns that have since escaped into surrounding forests. Morton emphasized that human-started fires account for nearly all current outbreaks, noting "lightning ignites less than 1 percent of fires" in this wetter-than-expected region.

Fire scientists anticipate the crisis will expand northward through November and December 2026 into Roraima, northern Pará, and Amapá states, as well as parts of Venezuela, Guyana, and Suriname. A subsequent peak in southern Amazon fire risk is projected for August and September 2027. The recurring nature of these events—where previously burned forests become increasingly vulnerable to intense combustion—raises concerns about long-term ecosystem resilience in fire-adapted tropical forests.

Morton urged heightened caution regarding intentional burning practices, stating, "Given the intensity of this El Niño, this really is the year for people to avoid burning at all costs."

The situation underscores broader climate connections between tropical rainfall disruptions and global fire patterns, with researchers highlighting the need for improved detection systems to address observational gaps in smoky conditions.