Mean pollutant concentrations by year and difference in pollutant concentration from post-tunnel year compared to pre-tunnel year.
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aDifference between pre-tunnel and first post-tunnel years, estimated by autoregressive analysis. bPre-tunnel is 25 March 06–24 March 07 and first post-tunnel year is 25 March 2007–24 March 2008. Data for only one post-tunnel year available. cAdjusted for change in air quality at the three Sydney regional sites (averaged).
创建时间：
2012-11-29
