Fig. 6.

Average equivalent sampling flowrates (mL/min, mean ± 1SD) for passive samplers calibrated against the Button Aerosol Sampler operated at 4,000 mL/min. It should be noted that, as with all calibrations of this kind, the presented equivalent sampling flowrates are likely location and sampling condition specific. The number of samples presented here by each sampler for the total collection of bacteria + fungi (culturable + non-culturable) as enumerated by Acridine Orange staining and counting by microscopy are: Button Sampler (n=120 across campaigns 1–4), passive PTFE filter (n=24 across campaigns 1–4), REPS (n=24 across campaigns 1–4). The number of samples presented here by sampler for the culturable collection of bacteria and fungi as enumerated by CFU are: Button Sampler (n=120 across campaigns 1–4 per microbe type), passive PTFE filter (n=24 across campaigns 1–4 per microbe type), REPS (n=24 across campaigns 1–4 per microbe type).