January 2009 :  A new paper in the blue journal

The paper “Improvement in PM10-exposure and reduced rates of respiratory symptoms in a cohort of Swiss adults” by Christian Schindler and co-workers has just been accepted for publication in the “blue journal” (i.e. the American Journal of Respiratory and Critical Care Medicine). In this paper, Sapaldia investigators show that people who lived at places  with a larger improvement of air quality between 1991 and 2002 were less likely to report chronic cough, phlegm or wheezing with dyspnea than people living at places with less improvement. This paper is an important addition to the work published in December, 2007, by the Sapaldia investigators in the New England Journal of Medicine (Downs SH et al, N Engl J Med 2007, 357, 2338). In this article, the improvement of PM10 was associated with an attenuation of the individual, annual decline of lung function. Thus, the new publication anchors the results of the previous one: not only lung function, but also symptoms continue to improve in the general population when air quality improves.