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