Ultrafine particles stem from a variety of natural and human-made sources, including vehicle exhaust. Joe Raedle/Getty Images

Tiny airborne particles within air pollution could be a silent killer – new study uncovers hidden risks and reveals who’s most at risk in New York state

Ultrafine particles are approximately one-thousandth the width of a human hair. But because of their tiny size, they are easily inhaled – and typically more dangerous than larger particles.

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