THURSDAY, Dec. 6 (HealthDay News) -- As air pollution in the
United States declines, it appears Americans are living longer,
according to a new study.
Researchers from the Harvard School of Public Health have
associated increased longevity with reductions in fine particulate
matter. They noted this positive trend would continue if the
country's air quality continues to improve.
"Despite the fact that the U.S. population as a whole is exposed
to much lower levels of air pollution than 30 years ago because of
great strides made to reduce people's exposure, it appears that
further reductions in air pollution levels would continue to
benefit public health," said study lead author Andrew Correia, a
doctoral candidate in the department of biostatistics, in a Harvard
Exposure to fine particle air pollution, or small particles with
a diameter of 2.5 micrometers or less, has been linked to
cardiopulmonary disease and death, the researchers explained. The
study examined the health effects of fine particle air pollution on
people living in more than 500 U.S. counties from 2000 to 2007.
Their work, published online Dec. 3 in the journal
Epidemiology, expands on previous research published in
Although the reductions in air pollution have slowed in the
United States over the past decade, the study revealed that a
modest drop of 10 micrograms per cubic meter in the concentration
of fine particulate matter was associated with an average increase
of a little more than four months in life expectancy.
The researchers noted the link between declines in air pollution
and increased life expectancy was stronger in more densely
populated urban areas than rural counties. They suggested that
differences in the composition of the particulate matter may
explain this discrepancy. Women also benefited from the improved
air quality more than men, the study revealed.
"Since the 1970s, enactment of increasingly stringent
air-quality controls has led to improvements in ambient air quality
in the United States at costs that the U.S. Environmental
Protection Agency has estimated as high as $25 billion per year,"
said study senior author Francesca Dominici, professor of
biostatistics at Harvard.
"However, the extent to which more recent regulatory actions
have benefited public health remains in question," Dominici added.
"This study provides strong and compelling evidence that continuing
to reduce ambient levels of [fine particle air pollution] prolongs
The study found an association between improved longevity and
cleaner air, but it did not prove cause-and-effect.
The U.S. Environmental Protection Agency provides more
information on the
health effects of air pollution.
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