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. 2015 Oct 9;124(5):619–626. doi: 10.1289/ehp.1509761

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Land use of the study area and the location of the monitoring sites for grass pollen [ESRI Data & Maps 9.3; ArcWorld Supplement; National Land Survey of Finland (http://www.maanmittauslaitos.fi/en/kartat)]. Urban land use refers to high-density (e.g., block of flats, commercial and industrial) land use types, parks to managed grasslands, fields to cultivated fields, and wasteland to unmanaged grasslands.