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. 2014 Oct 24;123(2):135–143. doi: 10.1289/ehp.1408646

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Decadal (2001–2010) mean PM_2.5 concentrations over Europe. The top panel displays satellite-derived values. The lower right panel contains ground-based values in operation at least 3 years during this period. The lower left panel provides a scatterplot and statistics (slope = 0.78; r = 0.73; n = 512; 1‑σ error = 1 μg/m³ + 21%) of the two data sets, sampled on the same years but noncoincidently on a daily basis. The 1:1 line is solid. The line of best fit is dash–dot. The observed 1-σ error is dotted. Numeric data for GBD regional means are provided in Table 1. A common, logarithmic color scale is used for Figures 1–4.

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