Ambient air pollution and years of life lost in Ningbo, China

To evaluate the burden of air pollution on years of life lost (YLL) in addition to mortality, we conducted a time series analysis based on the data on air pollution, meteorological conditions and 163,704 non-accidental deaths of Ningbo, China, 2009-2013. The mean concentrations of particulate matter with aerodynamic diameter <10 mu m, particulate matter with aerodynamic diameter <2.5 mu m, sulfur dioxide and nitrogen dioxide were 84.0 mu g/m(3), 60.1 mu g/m(3), 25.1 mu g/m(3) and 41.7 mu g/m(3), respectively. An increase of 10-mu g/m(3) in particulate matter with aerodynamic diameter <10 mu m, particulate matter with aerodynamic diameter <2.5 mu m, sulfur dioxide and nitrogen dioxide was associated with 4.27 (95% confidence interval [CI] 1.17-7.38), 2.97 (95% CI - 2.01-7.95), 29.98 (95% CI 19.21-40.76) and 16.58 (95% CI 8.19-24.97) YLL, respectively, and 0.53% (95% CI 0.29-0.76%), 0.57% (95% CI 0.20-0.95%), 2.89% (95% CI 2.04-3.76%), and 1.65% (95% CI 1.01-2.30%) increase of daily death counts, respectively. The impact of air pollution lasted for four days (lag 0-3), and were more significant in the elderly than in the young population for both outcomes. These findings clarify the burden of air pollution on YLL and highlight the importance and urgency of air pollution control in China.