Industrial Hygiene

Definition• “The recognition, evolution and control of various

Environmental Conditions that may have a adverse effect on health, that may be uncomfortable or irritating or that may have some undesired effect upon the ability of individual to perform their normal work”

EnvironmentalCondition

Recognition

Evolution

Control

Affects Health

Produces irritation or discomfort

Reduces Working

capability

Environmental Condition

Chemical Stresses

Biological Stresses

Physical Stresses

Ergonomic Stresses

Chemical Stresses Chemical compounds in form of dusts, fumes, smoke, mists, gases, vapors and liquid

Routes of Entry (Pathways of entry)

Routes of Entry

Inhalation GasesVapors

Particulate Matter (Dusts, Fumes,

Smoke, Aerosols Mists)

AbsorptionVia

Hair FolliclesOr Dissolving into fats and oils of skin

Phenols, Lead Acetate, Lead Oleate, salts of Lead, Arsenic

mercury

IngestionToxic,

Carcinogenic, Pathogenic.

InjectionInfectious

Micro-Organisms

Physical Classification of Airborne Materials• Dust --------------------0.1 to 25 µm (micrometer) • Fumes ----------------- less than 1 µm• Smoke ----------------- Less than 0.1 µm• Aerosols---------------fine particles to be stayed in air• Mists • Gases • Vapours

Hazards involved • Hazards associated with breathing a gas, vapor or mist usually

depends upon the solubility of substances.• If compound is highly soluble will impose a rapid impact, and

Dusts• Produced:

• Handling, Crushing, Grinding, Rapid Impact, Detonation, and Decrepitating

• Normal eye can see up to particle size 50 µm• Particle size below 10 µm can be seen by microscope and are not

settleable