There was also an increase in hospital visits by elderly patients complaining of respiratory illnesses when "coarse," or large, particle pollution was plentiful, although the rise was not significant, the researchers said.

"Though the evidence is mixed at this point, we did find an association between cardiovascular admissions and coarse particulate matter," Roger Peng of Johns Hopkins University in Baltimore, who led the study, said in a telephone interview.

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Terug US Study Sees Threat From Big-Particle Pollutants Datum 14/05/2008 Door goedele Type Internationaal, Lucht en geur, Maatschappelijk, Persoverzicht, Website On days when there is a lot of dust and other large-particle pollutants in the air, slightly more elderly people go to hospital emergency rooms with heart problems, US researchers said on Tuesday.