Figure 1From: Identification and verification of ultrafine particle affinity zones in urban neighbourhoods: sample design and data pre-processinga) study area; b) LR fit to an average of both fixed-site datasets, themselves averaged by day; c) Summary of MLR fits to hourly fixed-site datasets. MLR fits are given with the direction of the relationship and covariates marked with * indicate that their coefficients are significantly different from zero at the 99.9% level.Back to article page