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. 2007 Aug 14;115(11):1638–1645. doi: 10.1289/ehp.10177

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Measured versus modeled annual PM₁₀ concentrations for all Swiss sites including those in the SAPALDIA areas (in white) in (A) 2000 [SAPALDIA areas: y = 1.9 + 0.87x (R² = 0.68, n = 15); all sites: y = 5.2 + 0.72x (R² = 0.55, n = 57] and (B) 1990 [SAPALDIA areas: y = 8.6 + 0.6x (R² = 0.45, n = 8); all sites: y = 8.6 + 0.61x (R² = 0.63, n = 25)]. Traffic sites are within 20 m of a major road.