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A variety of corals form an outcrop on Flynn Reef, part of the Great Barrier Reef near Queensland, Australia.

Increasing ocean alkalinity may also help protect corals from ocean acidification.

Soon after exposure, the nanoparticles were detected in blood and urine, lead author Dr Mark Miller said.

A study of more than 6,500 people in the US found that just three months of exposure to high air pollution was enough to see HDL levels fall.

'The findings suggest that nanoparticles can travel from the lungs into the bloodstream and reach susceptible areas of the cardiovascular system where they could possibly increase the likelihood of a heart attack or stroke.'Fumes and toxins in polluted air are estimated to contribute to the deaths of 40,000 people in Britain every year.

Many scientists have long suspected that fine particles, particularly black carbon, which is emitted from diesel exhausts, travel from the lungs into the bloodstream.

But evidence supporting the assumption in humans had been challenging to collect, until now.

This would lead to a build-up of calcium, magnesium, or sodium ions in seawater and thus an uptake of CO to form bicarbonate ions.