Table 1.

Descriptions of commercially available spore traps based on impaction of particles for collection

Sampler	Description	References	Flow Rate (L min-1)	Collection Efficiency d50 (µm)a	Sample period	Compatible with analysis method
						Culture	Microscope	Biosensor/molecular
Burkard Seven Day http://www.burkard.co.uk/7dayst.htm	Impaction (Hirst-type with rotating collection surface)	Lacey & West (2006)	10	2.2	7 days	No	Yes	Y – requires processing steps
Andersen sampler	Multi-stage (cascade) impactor onto agar plates via progressively finer air inlet-pores to fractionate particles by size	Andersen (1958)	28.6	Stage 1 = 8 Stage 6 = >0.43	0.2–20 min otherwise collection plates are overloaded	Yes	Processing needed to make a spore suspension or collect onto waxed slides	Yes - requires processing steps
Marple Series 290 Personal Cascade Impactor http://www.newstarenvironmental.com/product/marple-series-290-personal-cascade-impactor	A miniaturised multi-stage personal cascade impactor with terminal filter	Rubow et al. (1987)	2	0.52-21.3 (in stages)	<1 day	Yes – after processing	Yes	Yes – after processing
Airtrace environmental http://www.pmeasuring.com/particleCounter/microbialAirSamplers/AirTrace	Impaction via air intake slit onto agar-plate		28.3		1 hour	Yes	Processing needed to make a spore suspension	Yes – after processing
Rotorod or rotating-arm (various manufacturers)	Impaction onto leading edge of rotating-arms	Lacey & West (2006)	Typically 100-150	10-20	Typically up to 12–24h before overloaded depending on concentration	No	Yes	Yes – requires processing steps
Air-O-Cell http://www.zefon.com/store/air-o-cell-sampling-cassette.html	Impaction onto adhesive-coated slide	Kalatoor et al. (1995)	4	<1		Yes (suspension and plating needed)	Yes	Yes – requires processing steps
ChemVol High Volume Cascade Impactor http://o.b5z.net/i/u/10004484/i/brochures/Particulate%20Monitoring/ChemVol_Model_2400_Brochure.pdf	Four, progressively finer impaction stages and a terminal ultra-fine filter. The poly urethane foam impaction substrate reduces particle bounce and allows sampling over extended periods	Buters et al. (2012)	900	Large >9 Coarse = 9-4 Fine = 4-1 Forth = 1-0.2 Ultrafine <0.08	>1 week	Yes (suspension and plating needed)	Yes (suspension needed)	Yes
MTIST	Impaction (into microtitre-plate wells)	Kennedy et al. (2000)	57	≈2	Up to 7 days	Yes	Yes (suspension in liquid needed)	Yes

^ad50 is the aerodynamic diameter or size of particles above which 50% or more are collected and below which, less than 50% are collected.