Micron Size Comparison Chart

Particle	Particle Size (Microns)
postage stamp (1 inch)	25,400
beach sand	100-2000
eye of a needle	1230
pollens	10-1000
saw dust	30-600
coffee	4-400
dust mites	100-300
table salt	120
human hair	70
lower limit of visibility (naked eye)	40
household dust	40
mold spores	10-30
white blood cells	25
talcum powder	10
red blood cells	8
bacteria	3
spider web	2-3
lead dust	2
corn starch	0.1-0.8
tobacco smoke	0.5
90% of all oil contaminants	0.5-2
0.001 millimeter	1