Key points from article :
Air pollution now ranks among the top 10 major risk factors for attributable death worldwide.
Ultra-fine particles go deep into the lungs and then reach other organs, including the brain.
Cleaner air could prevent heart disease, cancers and poor brain development in children.
Ultra-fine particles can reactivate the herpes virus which lies dormant among carriers.
Studies are needed to look at the impact of fine particles on cognitive development.
