Articles on Ultrafine particles
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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.
Researchers found 10 times more black carbon on the 15th Street/City Hall subway platform than on the sidewalk above.
Living next to a highway is not great for health, but a new study shows that running air filters indoors can remove tiny particles of pollution and lower blood pressure.


