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Posted: Dec 11, 2013
Black carbon: Better monitoring needed to assess health and climate change impacts
(Nanowerk News) Black carbon is an air pollutant which harms human health and can contribute to climate change – so cutting emissions may have many benefits. The European Environment Agency (EEA) has published a report on the measurement of black carbon in the air.
As the effects of this pollutant have become better understood in recent years, it is increasingly seen as an important target of environmental control. Authors of the EEA report hope that the study will encourage more comprehensive monitoring of this pollutant, which is currently patchy.
Health and climate effects
Black carbon is the sooty part of particulate matter (PM) formed by the incomplete combustion of fossil fuels and biomass. It is mostly emitted by vehicles, non-road mobile machinery such as forestry machines, ships, coal or wood burning stoves in homes. Another important source is open biomass burning including forest fires and agricultural waste burning.
Of all air pollutants, PM is the most harmful to health in Europe. The black carbon part of PM is particularly harmful as it represents a mixture of very fine, partly carcinogenic particles, small enough to enter the bloodstream and reach other organs.
There is currently a lively debate about whether reducing this pollutant could have significant gains in reducing climate change, with a recent study ("Bounding the role of black carbon in the climate system: A scientific assessment") suggesting that black carbon’s effect on the climate is more potent than previously thought. In the atmosphere the carbon-containing pollutant effectively absorbs solar radiation leading to a warming of the atmosphere. When it settles on snow or ice, the darker colour absorbs more heat, accelerating melting.