BOULDER — Unregulated trash burning around the globe is pumping far more pollution into the atmosphere than shown by official records. A new study led by the National Center for Atmospheric Research estimates that more than 40 percent of the world’s garbage is burned in such fires, emitting gases and particles that can substantially affect human health and climate change.
Open burning of trash, as seen here in General Santos, Philippines, is a global phenomenon that has significant effects on air quality. (Photo courtesy Global Environment Facility.)
The new study provides the first rough estimates, on a country-by-country basis, of pollutants such as particulates, carbon monoxide, and mercury that are emitted by the fires. Such pollutants have been linked to serious medical issues.
The researchers also estimated emissions of carbon dioxide, the most common greenhouse gas produced by human activity.
Unlike emissions from commercial incinerators, the emissions from burning trash in open fires often go unreported to environmental agencies and are left out of many national inventories of air pollution. For that reason, they are not incorporated into policy making.
“Air pollution across much of the globe is significantly underestimated because no one is tracking open-fire burning of trash,” said NCAR scientist Christine Wiedinmyer, lead author of the new study. “The uncontrolled burning of trash is a major source of pollutants, and it’s one that should receive more attention.”
Quantifying the extent of burning trash may change how policy makers track emissions, as well as how scientists incorporate air pollution into computer models used to study the atmosphere.
Because trash burning is unregulated and unmonitored, Wiedinmyer said that actual emissions could be larger or smaller than the study’s estimates by a factor of two. Still, the analysis represents the most comprehensive effort to date to account for emissions from trash burning.
The new study, published in Environmental Science & Technology, was funded by the National Science Foundation, which is NCAR’s sponsor. It was co-authored by scientists from the University of Montana and the U.S. Environmental Protection Agency who were also involved in measuring the composition of trash-burning emissions.
Trash burning is a global phenomenon. But it is most prevalent in developing countries where there are fewer trash disposal facilities, such as landfills and incinerators.
The amount of garbage burned in remote villages and crowded megacities is likely on the rise, as more people worldwide are consuming more goods. The trash often contains discarded plastics and electronics as well as traditional materials such as food scraps and wood.
Wiedinmyer began wondering about the impact of burning trash while visiting remote villages in Ghana. The villages were shrouded in smoke caused in part from trash fires that smoldered all day.
To estimate emissions from trash fires, Wiedinmyer and her co-authors compared population figures and per capita waste production with official tallies of trash disposal for each country in the world. They estimated that 1.1 billion tons (1 billion metric tons), or 41 percent, of the total waste generated worldwide is disposed of through unregulated burning every year.
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