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.
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.
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,” said, Tom Vogl, an assistant professor of economics and international affairs at Princeton.
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.
“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,” said the researchers.
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.
Source | http://www.news-medical.net