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Diesel fumes alter the structure of the heart and increases risk of cardiovascular diseases.
They found those who lived in areas of high diesel air pollution were more likely to have an enlarged chamber on the left side of their heart.
If this left ventricle becomes too big the heart loses pressure and power.
This means it cannot pump as much blood, raising the risk of heart attack, heart failure and death.
Experts are aware of the impact of diesel fumes on human health, including the risk of asthma, dementia and cancer.