Associations between short/medium-term variations in black smoke air pollution and mortality in the Glasgow conurbation, UK

► A time series study of air pollution and mortality over a 25 year period ► Compares estimates of short and medium term exposure-mortality associations ► Effects of black smoke on mortality evident for lag periods in excess of two weeks ► Medium term exposure-mortality associations greater than short-term associations ► Implications for exposure averaging periods specified in air quality standards