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Table 2 Estimates of the proportions of carbonaceous, secondary inorganic, and sea-salt and dust material within UK urban PM10 and PM2.5, in the 1970s and late 1990s, derived from the individual component concentrations given in Table 1

From: A chronology of ratios between black smoke and PM10 and PM2.5 in the context of comparison of air pollution epidemiology concentration-response functions

chemical component

PM10

PM2.5

1970s

late 1990s

1970s

late 1990s

carbonaceous

0.5–0.7

0.3–0.4

0.6–0.8

0.3–0.5

secondary inorganic

0.2–0.4

0.3–0.4

0.25–0.4

0.4–0.6

sea-salt and dusts

0.1–0.15

0.2–0.3

0.05

0.05–0.15