Fig. 6.

Selected period (23th to 27th May). The plots represent (from upper to the bottom): (1) hourly counts of number of clusters; (2) airport traffic (arrivals + departures); (3) solar irradiation; (4) nitrogen oxide concentration; (5) sulphur dioxide concentration; (6) particle number concentration for the nucleation range (14–30 nm); (7) particle number concentration for the Aitken range (30–100 nm); (8) particle number concentration for the accumulation range (100–1000 nm); (9) BC concentration; (10) contour plots of SMPS data.