Fig. 3.

Temporal, spatial and size characterisation of particles generated during AGPs (measured by HR-ELPI) for each location (1-6; Table 1) and intervention group (A-E; Table 2). Acquisition of air samples were performed during the baseline period (0-3 minutes), during the six procedures (3-21 minutes) and following cessation of procedures (21-36 minutes). Each data point represents the median particle concentration per size bin (# cm^-3) derived from n = 3 replicates. The dotted lines indicate the lower reported size for a SARS-CoV-2 virus particle (50 nm diameter)