Older adults who breathe in very small particles from air pollution for even a day or two are more likely to be hospitalized for many diseases, a recent U.S. study suggests.  Researchers examined particles called PM2.5, a mixture of solid particles and liquid. The particles are too small for the eye to see; each one is about three percent of the size of a human hair or smaller.

PM2.5 can include dust, dirt, soot and smoke.

Credit: iStock, bo1982

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