Cleanroom Particle Generations and Average Particle Generations by Human Activity and Clothings

What is Particle Concentration?
The number of particles detected per unit volume of air 

Particle Concentration in Different Locations

Place                Number of Particles per cubic foot 
                         (greater than or equal to 0.5µm)

Town                1000000
Mountain          100000
Moon                100
Industrial          10000000

Particles Generated by Clothing Activities

Activity                     Normal Street Clothing  Laboratory Clothing   Cleanroom Garments

Sitting Still                448000                             142000                        14920

Sitting and
 Moving Arms          4450000                            462000                        48600

Standing 
and Rotating             2240000                            390000                        31700

Walking Rapidly      5380000                            1285000                       15700


Particles Generated from Human Activity

Activity                                 Number of Particles released

Sitting                                   100000

Sitting awith 
Rotating Arm 
Movements                          500000

Rising Up 
and Sitting Down                 2500000

Running and 
Walking Up                          10000000


Particles Generated From Human Beings

Human skin can produce upto 1 x 106 microorganisms per cm2

Human saliva can contain upto 1 x 109 microorganisms per ml

Nasal Wash (from healthy person) can obtain 1 x 106 microorganisms per ml

The aerosol produced by sneezing (if no barrier is used) can contain 100000 microorganisms

Human excrement can contain 1x1012 microorganisms per g. This figure correspondance to approximately 50% of the dry weight of the excrement