Nav: Home

Agricultural fires in Brazil harm infant health, a warning for the developing world

January 25, 2017

Pollution from the controlled fires that burn across Brazil's São Paulo state during the sugarcane-harvesting season has a negative impact on infant health nearby. But the health of those same infants likely benefits from the economic opportunities the fires bring to their parents.

Researchers at Princeton and Duke universities gathered information from satellites, pollution monitors and birth records to untangle those competing influences and accurately measure the impact of pollution from the fires.

They found that exposure to pollution from the fires in the last few months of gestation leads to earlier birth and smaller babies, and they found some evidence of increased fetal mortality. Conditions in early life, including in utero, have been shown to affect children's longterm outcomes, not only in terms of health but also their educational and economic success.

The findings suggest that policymakers in Brazil and across the developing world should pay more attention to the negative health impact of pollution from fires that are often part of traditional farming techniques, even though the pollution doesn't usually reach levels considered dangerous by industrial standards.

"Policymakers often think about heavily polluted cities like Beijing or New Delhi, but our results show that these agricultural fires are consequential," said Tom Vogl, an assistant professor of economics and international affairs at Princeton.

Vogl and co-author Marcos Rangel, assistant professor at Duke University's Sanford School of Public Policy, detailed their findings in a working paper titled "Agricultural Fires and Infant Health" released online in December by the National Bureau of Economic Research.

Brazil is the world's leading producer of sugarcane, and São Paulo state accounts for more than two-thirds of the nation's production. The traditional approach to harvesting begins with burning the fields to remove straw and other materials, leaving the cane to be cut by hand. Although mechanized harvesting, which doesn't use fires, is becoming more common in Brazil, traditional techniques are still widely used there and across the developing world.

The researchers used remote-sensing data from satellites to track fires, which burn throughout the six-month harvesting season. That data was combined with pollution and weather information collected by 13 air-quality monitoring stations.

"We find that fires that are upwind from population centers increase pollution levels in those areas and other fires don't increase pollution nearly as much," Vogl said.

The researchers then linked the fire and pollution information to vital records and hospitalization records from the Brazilian government. Altogether the information allowed the researchers to compare how the health of infants responded to fires that had different effects on pollution in their communities.

The key to the research design, Vogl said, was incorporating information on wind direction, which allowed the researchers to parse out the consequences of pollution from the fires from the beneficial things that are correlated with the fires.

"We would get the answer completely wrong if we just looked at the relationship between fires and infant health in general," Vogl said. "The reason is that these agricultural fires are necessarily connected with economic activity. When there's more sugarcane harvesting, there are more fires. And when there is more sugarcane harvesting, people have higher incomes, which can be good for kids and kids' health."

Rangel added that sustainable development policies need to take into account trade-offs between economic and environmental goals.

"Our results point to a dirty side of clean fuel policies in Brazil," Rangel said. "To some extent, the incentives for ethanol production for cleaner fuel in urban areas have considerable side effects on the population and future generations in the production areas.

"By appropriately measuring how much ill comes with the blessings of a strong agricultural cycle, our work highlights the need for evidence-based policies across the globe," Rangel said.

Prashant Bharadwaj, an assistant professor of economics at the University of California-San Diego who studies development and labor economics, said the research helps fill an important gap by looking at persistent, moderate pollution like that from agricultural fires.

"Controlled burns for the purposes of agriculture are very popular in developing countries where the density of population near agricultural areas is also large; hence, their study has important implications for not only large parts of the world, but also for the significant portion of the world's population that resides in poorer agricultural settings," Bharadwaj said. Vogl said the researchers, who began their collaboration when Rangel was a visiting professor at Princeton, are working to apply the same technique to examining agricultural fires in Africa.
-end-
Financial support for the research came from Princeton's Health Grand Challenge, an integrated research and teaching program that seeks solutions to the pressing problems of global health and infectious disease. Funding was also provided by the Duke Population Research Center under NIH award number 2P2CHD065563.

The NBER is a private, non-profit, non-partisan organization dedicated to conducting economic research and to disseminating research findings among academics, public policy makers and business professionals. They publish academic working papers, which do not go through a formal peer-review process.

Princeton University

Related Pollution Articles:

Combatting air pollution with nature
Air pollution is composed of particles and gases that can have negative impacts on both the environment and human health.
Nature might be better than tech at reducing air pollution
Adding plants and trees to the landscapes near factories and other pollution sources could reduce air pollution by an average of 27 percent, new research suggests.
Aspirin may prevent air pollution harms
A new study is the first to report evidence that nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin may lessen the adverse effects of air pollution exposure on lung function.
Is pollution linked to psychiatric disorders?
Researchers are increasingly studying the effects of environmental insults on psychiatric and neurological conditions, motivated by emerging evidence from environmental events like the record-breaking smog that choked New Delhi two years ago.
New polymer tackles PFAS pollution
toxic polyfluorinated alkyl substances (PFAS) pollution -- commonly used in non-stick and protective coatings, lubricants and aviation fire-fighting foams -- can now be removed from the environment thanks to a new low-cost, safe and environmentally friendly polymer.
A new view of wintertime air pollution
The team's unexpected finding suggests that in the US West and elsewhere, certain efforts to reduce harmful wintertime air pollution could backfire.
Tracking the sources of plastic pollution
Plastic pollution in the world's oceans is now widely recognized as a major global challenge -- but we still know very little about how these plastics are actually reaching the sea.
Delhi's complicated air pollution problem
According to the World Health Organization, Delhi is the world's most polluted large city.
A warming world increases air pollution
The UC Riverside-led study shows that the contrast in warming between the continents and sea, called the land-sea warming contrast, drives an increased concentration of aerosols in the atmosphere that cause air pollution.
China's war on particulate air pollution is causing more severe ozone pollution
In China, the rapid reduction of the pollutant PM 2.5 dramatically altered the chemistry of the atmosphere, leading to an increase in harmful ground-level ozone pollution, especially in large cities.
More Pollution News and Pollution Current Events

Top Science Podcasts

We have hand picked the top science podcasts of 2019.
Now Playing: TED Radio Hour

In & Out Of Love
We think of love as a mysterious, unknowable force. Something that happens to us. But what if we could control it? This hour, TED speakers on whether we can decide to fall in — and out of — love. Guests include writer Mandy Len Catron, biological anthropologist Helen Fisher, musician Dessa, One Love CEO Katie Hood, and psychologist Guy Winch.
Now Playing: Science for the People

#542 Climate Doomsday
Have you heard? Climate change. We did it. And it's bad. It's going to be worse. We are already suffering the effects of it in many ways. How should we TALK about the dangers we are facing, though? Should we get people good and scared? Or give them hope? Or both? Host Bethany Brookshire talks with David Wallace-Wells and Sheril Kirschenbaum to find out. This episode is hosted by Bethany Brookshire, science writer from Science News. Related links: Why Climate Disasters Might Not Boost Public Engagement on Climate Change on The New York Times by Andrew Revkin The other kind...
Now Playing: Radiolab

Breaking Bongo
Deep fake videos have the potential to make it impossible to sort fact from fiction. And some have argued that this blackhole of doubt will eventually send truth itself into a death spiral. But a series of recent events in the small African nation of Gabon suggest it's already happening.  Today, we follow a ragtag group of freedom fighters as they troll Gabon's president - Ali Bongo - from afar. Using tweets, videos and the uncertainty they can carry, these insurgents test the limits of using truth to create political change and, confusingly, force us to ask: Can fake news be used for good? This episode was reported and produced by Simon Adler. Support Radiolab today at Radiolab.org/donate.