A new report suggests that underground carbon storage projects in Europe could lead to positive and negative effects on air pollution, depending on the pollutant in question. Carbon capture and storage (CCS) is considered in European legislation as a ‘bridging technology’ – a medium-term solution to climate change. Although the overall air quality impact of CCS is expected to be positive, the legislation notes that the technology should not be seen as a replacement for commitments to developing a greener and more energy-efficient economy.

Researchers have measured the presence of carbon nanoparticles in the air over the Mediterranean Sea. The results revealed that higher concentrations are found in air that has moved over areas of industrial activity, and that the lowest layers of the atmosphere are likely to be responsible for transporting the nanoparticles.

Pollen allergy is a common cause of allergic respiratory diseases such as hay fever and asthma. A recent continent-wide study suggests that rising carbon dioxide (CO2) emissions over the last 30 years may be increasing pollen counts especially in European cities, which could have serious consequences for public health.

Man-made pollutants may be responsible for the expansion of the tropics in the northern hemisphere, according to recent research. Black carbon aerosols and tropospheric ozone, formed from human activities, are heating the atmosphere and shifting major atmospheric circulation patterns further north, which could create drier conditions in the subtropics.

Measures to control methane and black carbon (soot) emissions could improve air quality and public health, in addition to slowing the rate of climate change, according to recent research. By 2030, the reduced pollution could prevent between 700,000 and 4.7 million premature deaths each year, with 80% of the benefits occurring in Asia.

Air pollution from the world’s megacities not only has local impacts, but can spread to remote regions of the world. Recent research has highlighted, for example, that megacities are a source of black carbon pollution in lowest kilometre of atmosphere in the Arctic, with European megacities contributing more than others.

Levels of airborne polycyclic aromatic hydrocarbons (PAHs) are falling at urban and rural sites in Europe and North America, according to recent research. These results contribute to growing evidence demonstrating that the legislation to reduce these harmful emissions has been successful. Concentrations of PAHs in urban areas were highest, the researchers found, but they were also declining at the fastest rate.

The BIOAMBIENT.ES project is the first human biomonitoring programme to estimate levels of environmental pollutants at national level in Spain. This study reports its findings on polycyclic aromatic hydrocarbons (PAHs), chemicals that are ubiquitous in the environment. The results will help to establish reference values, identify highly exposed populations and evaluate effectiveness of policies.

Measurements of individual vehicle emissions are usually made in laboratory tests. In this study, researchers followed cars driving in real conditions to measure emissions of air pollutants, including black carbon and nitrogen oxides. The study shows that diesel cars contribute disproportionately to air pollution, and highlights the value of on-road measurements.

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