Bad Breath | Science News

Real Science. Real News.

Science News is a nonprofit.

Support us by subscribing now.


Bad Breath

Studies are homing in on which particles polluting the air are most sickening — and why

2:15pm, July 3, 2009

Tasteless. Invisible to the eye. Air contaminants less than a tenth the size of a pollen grain are nevertheless dangerous.

Even on a clear, sunny day, many tens of thousands — and potentially millions — of tiny particles cloud every breath you take. Some are nearly pure carbon. But reactive metals, acids, oily hydrocarbons and other organic chemicals jacket most of these motes.

Epidemiologists have been calculating human tolls by comparing how many people die when particle numbers in the air are high against mortality figures on cleaner days. Over the past couple of decades, those data have been implicating tiny airborne particles in the deaths of huge numbers of people each year — even where concentrations of these microscopic contaminants never exceed levels permitted by U.S. law.

Based on extrapolations from such data, in China alone an estimated 1 million people die prematurely each year from the toxic inhalation of tiny airborne specks, a

This article is only available to Science News subscribers. Already a subscriber? Log in now.
Or subscribe today for full access.

Get Science News headlines by e-mail.

More Science & the Public posts

From the Nature Index Paid Content