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Abstract
In one of the largest analyses to date, this study found that exposure to outdoor air pollution is linked to decreased lung function and an increased risk of developing COPD. While lung function normally declines as we age, we found that air pollution may contribute to the ageing process and adds to the evidence that breathing in polluted air harms the lungs. Results show that for each annual average increase of five micrograms per cubic meter of fine particulate matter (PM2.5) pollution in the air that participants were exposed to at home, the associated reduction in lung function was similar to the effects of two years of ageing. For the same increment in exposure to PM2.5, there was a 52% increase in the odds of COPD.