The Bhalswa landfill, on the outskirts of Delhi, is an apocalyptic place. A gray mountain of dense, decaying trash rises seventeen stories, stretching over some fifty acres. Broken glass and plastic containers stand in for grass and stones, and plastic bags dangle from spindly trees that grow in the filth. Fifteen miles from the seat of the Indian government, cows rummage for fruit peels and pigs wallow in stagnant water. Thousands of people who live in slums near the mountain’s base work as waste pickers, collecting, sorting, and selling the garbage created by around half of Delhi’s residents.

This March was the hottest on record in India. The same was true for April. On the afternoon of April 26th, Bhalswa caught fire. Dark, toxic fumes spewed into the air, and people living nearby struggled to breathe. By the time firefighters arrived, flames had engulfed much of the landfill. In the past, similar fires had been extinguished within hours or days, but Bhalswa burned for weeks. “The weather poses a big challenge for us,” Atul Garg, the chief of the Delhi Fire Service, said, nine days after the fire began. “Firefighters find it difficult to wear masks and protective gear because of the heat.” A nearby school, blanketed by hazardous smoke, was forced to close. In the end, it took two weeks to extinguish the blaze. The charred bodies of cows and dogs were found in the debris.

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Uncontrolled waste fires burn at much lower and inconsistent temperatures, which means combustion is incomplete. This releases substances from the waste and creates new ones as molecules are decomposed and reformed in the flames. Dioxins and related compounds are often formed when PVC is burned in open fires. At least 30 of these types of compound are considered harmful to human health. They can persist in the environment for years and in the human body for perhaps a decade or more. There is evidence they can damage the brain and disrupt hormones.

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“If you do research or travel in developing worlds, you do see garbage burning in a lot of places,” he told Climate Central. Working in Indonesia in the 1990s, he said, there was an old man who would come around and gather everyone’s trash, then burn it at the end of the street.

Yokelson, who is another author of the recent paper, had made some measurements in Mexico of what sort of pollutants were being emitted by trash burning. The U.S. Environmental Protection Agency has catalogued emissions from trash burning in the rural areas of the U.S. But Wiedinmyer found that, on a global scale, “there wasn’t kind of a consistent story.”

To find that story took a lot of digging around and some educated guesswork. Along with data from the few studies like Yokelson’s, Wiedinmyer used guidelines for calculating trash burning emissions produced by the Intergovernmental Panel on Climate Change to determine how much waste was being generated and burned, what exactly was in that waste, and what types of chemicals were likely generated. What she came up with was, as the study describes it, “the first comprehensive and consistent estimates of the global emissions of greenhouse gases, particulate matter, reactive trace gases, and toxic compounds from open waste burning.”

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