The Environmental Protection Agency is tightening the standard for how much soot in the air is safe to breathe. Fine particles come from the combustion of fossil fuels by cars and industrial facilities. They're linked to all kinds of health problems, including heart attacks and lung ailments like asthma. States will be required to clean up their air to the level specified by the new standard.
Source: http://www.npr.org/2012/12/17/167427988/epa-targets-deadly-soot-pollution?ft=1&f=1007
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