Air Pollution May Increase Death Rate
Long-Term Exposure to Air Pollution, Even at Low Levels, May Raise Death Rate
July 31, 2007 -- The long-term effects of air pollution may include a higher
death rate, a new British study shows.
The study traces death rates among various British electoral wards from the
early 1980s through the late 1990s.
When the study began, more than 2 million people lived in those areas. As
the years passed, more than 420,000 died of various causes.
The researchers included Paul Elliott, FMedSci, of Imperial College London.
They focused on two types of air pollution: black smoke, which comes from
burning coal, and sulfur dioxide.
During the study period, air pollution levels dropped. But even so, adults
aged 30 and older living in areas with higher levels of air pollution had
higher death rates, especially from respiratory diseases, according to the
The researchers considered the fact that air pollution may be worse in
low-income neighborhoods. That didn't change the results.
"Our findings from extensive British data add to the evidence that air
pollution has long-term effects on mortality, and point to continuing public
health risks even at the relatively lower levels of black smoke and sulfur
dioxide that now occur," write Elliott and colleagues.
However, the study has some limits.
The researchers didn't check the medical histories of the people living in
the neighborhoods that were studied. So the study doesn't prove that air
pollution directly caused any deaths.
The findings appear in the advance online edition of the journal