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Volatile organic compound (VOC) emission rate factors are estimated for 49 tree genera based on a review of foliar emission rate measurements. Foliar VOC emissions are grouped into three categories: isoprene, monoterpenes and other VOCs. Typical emission rates at a leaf temperature of 30°C and a light intensity of 1000 μmol m⁻² s⁻¹ range from <0.1 to 70 μg C g⁻¹ h⁻¹ for isoprene, <0.1 to 3 μg C g⁻¹ h⁻¹ for monoterpenes, and < 0.5 to 5 μg C g⁻¹ h⁻¹ for other VOCs. Isoprene emission factors are given for biogenic emission models that incorporate canopy shading effects and thus require leaf-level emission rates and for emission models that do not include a canopy model and therefore require branch-level isoprene emission factors which already account for some shading.

Landscape-level emission rates are estimated by combining emission rate factors determined for tree genera with species …