Ozone may prove the key to the link between high temperature (they kind caused by climate change) and the increased risk of death from heart disease or stroke.

Rresearchers studied almost 100 million people in 95 different geographical areas across the US during the summer months of June to September, and looked at health and weather pollution between 1987 and 2000. During this period, 4 million heart attacks or strokes occurred, and when the authors plotted daily deaths against fluctuations in temperature during one day, they found that ozone was a common link: the higher the ozone level, the higher was the risk of cardiovascular death due to high temperatures.

Rising temperatures and the impact of ozone are likely to become increasingly important as the world heats up as a result of global warming.

Art credit: gimp-savvy.com

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