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Figure
Emissions of the secondary particulate precursor species are weighted by a particle formation factor prior to aggregation: primary PM10 = 1, SO2 = 0.54, NOx = 0.88, and (NH3) = 0.64 (de Leeuw, 2002).
For references, please go to https://www.eea.europa.eu/data-and-maps/figures/changes-in-emissions-of-primary-and-secondary-pm10-particles-by-source-category-1990-2006-eu-27-weighted-by-particle-formation-factors or scan the QR code.
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