Fig. 1 | Scientific Data

Fig. 1

From: Global high-resolution ultrafine particle number concentrations through data fusion with machine learning

Fig. 1

Geographical distribution of measurement locations in the dataset. Circle sizes indicate the number of observational datasets from each location (ranging from 1 to 21), while colours represent the mean particle number concentration (PNC) in cm−3 at each location. The background greyscale map shows global human population density on a logarithmic scale, providing context for the spatial relationship between measurements and population centres.

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