Table 2 The input feature set used to train the ML models and during the inference procedures.

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

Category

Feature Name

Resolution

Reference

Human Activity

Population

1 km - Yearly

47

Build-up volume

1 km - 5 Years

31

Degree of urbanisation

1 km - 5 Years

33

Human settlement

1 km - 5 Years

34

Road network

Line geometry - Static

46

Air Quality

NO2 concentration

1 km - Yearly

36

PM2.5 concentration

1 km - Yearly

37

Emissions

Black carbon

10 km - Monthly

39

Carbon dioxide

10 km - Monthly

39

Carbon monoxide

10 km - Monthly

39

Nitrogen oxides

10 km - Monthly

39

Meteorological

Temperature

25 km - Hourly

40

Boundary layer height

25 km - Hourly

40

Precipitation

25 km - Hourly

40

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