What happens when PM2.5 air pollutants enter the body?

Dr Nishith Chandra, the Principal Director of Interventional Cardiology at Fortis Escorts Heart Institute, called PM2.5 pollutant the "most dangerous" as it can easily enter bloodstream, causing inflammation of lining of blood vessel. It can cause abnormal calcium levels in the heart and trigger cardiac arrest. It can thicken blood vessels, affecting lungs, and increase risk of premature death.