The relationship between PM
and (a) all cause, (b) circulatory disease, and (c) respiratory disease mortality, stratified by household income tertiles. Models were adjusted for household income and were run separately for Eastern and Western Europe. PM10 concentration = 2004 population-weighted annual average (μg.m-3). Mortality rates = 3-year average 2004–2006 (deaths per 100,000). Error bars indicate 95% confidence intervals.