New Delhi, April 7 -- The level of air pollution in Delhi is the worst in comparison to other major cities around the world, says a WHO survey. It also has the fifth largest death rate of 1.5 million people dying every year. The short-term exposure to particulate matter (PM) present in air pollution contributes to acute cardiovascular, and may reduce life expectancy by a few years.

Air pollutants have been linked with blood vessel lining (endothelial) injury and construction of blood vessel, raised blood pressure, hypercoagulability, systemic inflammatory and oxidative stress response. Particulate matter can also cause autonomic imbalance leading to arrhythmia. The main source of PM 2.5 throughout the world is due to the human combustion o...