…atmospheric-derived inputs. The air pollution archives reconstructed from each site provided local evidence of environmental change at different temporal scales (>?200 to 50 years) which, when combined, allowed assessment of cross-regional spatial variations in the history of PM deposition throughout Merseyside. Figure 2 Geo-magnetic… down-core geomagnetic properties of DDP were characterised to decipher the dominating magnetic signals within the sediment stratigraphy (Fig.  2 ). Magnetic grains in sediment archives can derive from the surrounding catchment (e.g., soil grains), in situ formation (e.g., bacterial magnetosomes, reduction diagenesis and post depositional changes…

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