Reuters: Chronic exposure to outdoor air pollution seems to reduce lung function in otherwise healthy adults, a study suggests. "We know that very high levels of air pollution (such as those in the smogs of the 1950s) harm health, but until now the evidence that lower levels reduce lung function over the long term has been scanty because it requires such complex analysis," Dr. Lindsay J. L. Forbes, of the University of London, UK, told Reuters Health. Using survey data on a cross …