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EPA: 1 in 3 Americans breathing sooty air

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(Read caption) In 2006, the Environmental Protection Agency tightened its standards for tiny airborne particles, a move that added 15 new cities to the too-sooty list.

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The Environmental Protection Agency notified officials in 211 counties in 25 states that their air did not meet the agency's strengthened standards for levels of fine particles.

The PM 2.5 standard, as it's called, restricts the amount of airborne fine particles with a diameter smaller than 2.5 micrometers, or about one-thirtieth the diameter of a human hair. These particles, such as those emitted by power plants, livestock operations, diesel engines, and wood-burning stoves, are thought to be associated with poor health.

In 2006, the agency tightened the standards from 65 micrograms per cubic meter of air to 35 micrograms per cubic meter. If the levels of these fine particles in a given area exceed that figure for more than 24 hours, the area is considered not in compliance.

According to the Associated Press, the stricter standards mean that 15 new metro areas got failing marks. The EPA's list of too-sooty counties,  which are home 100 million Americans, now includes 46 cities.

States with areas that fall below the EPA's standards will have three years to develop plans for improving air quality, or risk fines. From there, the areas will have another two years to meet the standards.

“These designations are an important step in our steady march toward cleaner air,” said EPA Administrator Stephen L. Johnson in a press release. “We will continue working with our state and tribal partners to meet these air quality standards.”

The press release noted that, nationwide, monitored levels of fine particle pollution dropped 11 percent from 2000 to 2007.

Critics argue, however, that even though the air is getting less sooty, the EPA's enforcement is still too lax.

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