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. 2013 Jul 23;121(10):1142–1147. doi: 10.1289/ehp.1306768

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Bland–Altman plot of BlueSky PM_2.5 versus Monitor PM_2.5 measurements, excluding all pairs with zero BlueSky predictions. The x-axis is the average of BlueSky forecasts and monitor measurements, and the y-axis is the difference between the two. Points above zero suggest overpredictions from BlueSky compared with monitors. Dashed lines indicate mean ± 2 SD.