a) AURN_measurement_sites.pdf

This is a map showing the locations of the AURN measurement sites
which were used for the measurement-model comparisons in the main 
paper (Figure 4) and the other figures in this supplement.

b) compare_no2_8hrmean.pdf and compare_no_8hrmean.pdf

Comparison of NO2 and NO 8-hour means from AURN measurements 
(blue line) and model predictions (green and red lines for 
CBM-Z and CRIv2-R5 simulations, respectively). 
Measurement sites are: 
(A) Yarner Wood, 50.60 Lat, -3.72 Lon; 
(B) Bush Estate, 55.86 Lat, -3.21 Lon; 
(C) Aston Hill, 52.50 Lat, -3.03 Lon; 
and (D) St Oysth, 51.78 Lat, 1.05 Lon.

(AURN data is available here: http://uk-air.defra.gov.uk/networks/network-info?view=aurn )