Picture a pile of trash the size of Manhattan and taller than one and a half Empire State Buildings. That’s how much plastic waste the world is predicted to be generating every year by 2050 if nothing is done to change course.
It’s easy to think of recycling as the solution, but the vast majority of plastic waste now ends up in landfills, or worse.
A large amount of plastic waste gets shipped overseas. In a new study, my colleague and I analysed what happens when plastic waste is shipped to lower- and middle-income countries, where open burning is a common way of dealing with excess waste. The result, we found, is pronounced increases in toxic air pollution.
Plastic waste burning and health impacts
Between 40% and 65% of total municipal solid waste is openly burned in low- and middle-income countries, largely as a result of 2 billion people around the world having no municipal solid waste collection.
Open burning occurs both intentionally and unintentionally, the latter when open dump sites containing organic waste spontaneously combust due to heat generated as the waste degrades.
When plastic burns, it releases particularly toxic air pollutants. Fine particles can penetrate deep into people’s bodies, along with gases that include carbon monoxide, styrene gas and hydrogen cyanide. It also releases persistent organic pollutants such as polycyclic aromatic hydrocarbons and dioxins.
These particles and gases have been linked to health risks ranging from respiratory and cardiovascular disease to cancer and reproductive and neurological disorders.
The ash from open burning can also contaminate soil and groundwater with persistent organic pollutants, heavy metals and other toxicants, creating more chances for people to be exposed to them through food and water.
The global plastic waste trade
Large amounts of plastic waste are shipped around the world- some to be recycled and much to simply be disposed of in landfills or incinerated. In 2024, 9.34 million metric tons of plastic waste imports were reported, according to the United Nations.
Where this exported plastic waste ends up has been shifting
In 2018, China stopped importing plastic waste, causing the total amount of plastic waste moving among countries- at least through official channels- to drop dramatically. Between 1992 and 2016, China’s plastic waste imports made up 45% of global imports.
In 2018, the flow moved to other countries, largely in Southeast Asia but also other locations, including Turkey. In 2018, Indonesia became a net importer of plastic waste. The majority of this waste came from Western Europe, Australia and North America.
What happened to Indonesia’s air quality
We harnessed data from multiple monitoring systems, including satellite observations and cargo ship tracking signals, to understand where these plastic waste imports went and how much air pollution was released by openly burning this waste.
As of 2020, the World Economic Forum and Indonesia’s government estimated that 48% of Indonesia’s plastic waste is openly burned.
We found that particulate matter air pollution- of great concern for health-
increased an average of 3.3% at the locations of large open waste dump sites in Indonesia after China’s ban in 2018-19 relative to expected business as usual, based on data from 2012-17. We found increases up to 1.68 micrograms per cubic meter.
Based on risk estimates from a global study of mortality associated with long-term exposure to outdoor fine particulate matter, this corresponds to an approximate 1.5%, 1.9% and 3.5% increase in mortality risk from chronic obstructive pulmonary disease, lung cancer and lower respiratory infections, respectively.
New constraints on the plastic waste trade
In 2021, Indonesia restricted the import of nonhazardous waste to 15 specific ports and in 2025 banned the import of plastic waste altogether.
In mid-2025, Malaysia followed suit, allowing plastic waste only from countries that have ratified the Basel Convention on the Control of Transboundary Movements of Hazardous Wastes and their Disposal- a treaty that the U.S. has never ratified.
For these bans to be effective, these countries must also find ways to contend with illegal plastic waste shipments and paper imports contaminated by plastic waste.
Meanwhile, negotiations for an international, legally binding treaty on plastic waste, started in 2022, have stalled. In mid-2024 the European Union did pass a new regulation on waste shipments, prohibiting exporting plastic waste to countries outside the group of wealthy countries in the Organisation for Economic Cooperation and Development from November 2026 to at least May 2029.
The effectiveness of these and future policies at reducing air pollution – and other kinds of environmental degradation- can be evaluated using methods like ours.
Ways to reduce plastic waste
As of 2021, only 5% to 6% of U.S. domestic plastic waste was recycled, according to estimates from the advocacy group Beyond Plastics and Bennington College. It is now even harder to export plastic waste to other countries that could “recycle” it.
Part of the problem is lack of capacity: The Association of Plastic Recyclers estimates that current plastic reclamation facilities in the U.S. and Canada could at most increase their plastic recycling by 35% to 44%, depending on the type of plastic, leading to a total recycling rate of 7% to 9%.
Ultimately, both decreasing plastic use and increasing recycling will likely be needed to solve the problem. Beyond consumer choices, packaging reuse- creating packaging and return systems that put the same materials back to work – can reduce the need for new plastics.
Recycling experts call for harmonised design standards to help streamline processing and deliver higher-quality recycled plastics, as well as extended producer responsibility fees or taxes to raise the cost of producing products that aren’t recyclable.
Ultimately, reducing and better managing our nation’s plastic waste can help prevent global health harms. (The Conversation)
