Environmental Health: Determinants and Policy Perspectives

🔊 Auditory Effects (Hearing)

• Temporary Hearing Loss: Short-term exposure reduces hearing ability.
• Permanent Hearing Loss: Long-term exposure damages auditory nerve and inner ear (factory workers, airport staff, traffic police).
• Tinnitus: Ringing or buzzing sensation in ears.

🧠 Non-Auditory Effects

• Psychological: Irritability, anxiety, stress, poor concentration
• Sleep Disturbance: Difficulty sleeping, fatigue, reduced efficiency
• Cardiovascular: Increased BP, increased heart rate, hypertension risk
• Reduced Work Efficiency: Communication difficulty, poor productivity, increased accidents
• Effects on Children: Learning difficulties, reduced attention span

🛡️ Methods to Control Noise

A. Control at Source

• Proper maintenance of machines (lubrication)
• Use of silent machinery (low-noise equipment)
• Sound insulation – enclosing noisy machines with sound-proof materials

B. Control Along the Path

• Sound barriers (walls around noisy areas)
• Plantation of trees – green belts absorb sound
• Proper building design – use of acoustic materials

C. Control at Receiver Level

• Ear protective devices (ear plugs, ear muffs)
• Limiting exposure time – rotational duty of workers
• Health education about harmful effects of noise

D. Legislative Measures

• Enforcement of Noise Pollution Rules
• Restriction on loudspeakers and horns

💧 Removal of Temporary Hardness

1. Boiling
Principle: Boiling converts bicarbonates into insoluble carbonates.
Ca(HCO₃)₂ → CaCO₃ + CO₂ + H₂O
Advantages: Simple household method.
Disadvantages: Not suitable for large-scale use.

2. Lime Treatment (Clark’s Method)
Principle: Lime precipitates calcium salts. Used in municipal water treatment.

🧪 Removal of Permanent Hardness

• Washing Soda Method: Sodium carbonate precipitates calcium and magnesium salts.
• Permutit / Zeolite Method: Calcium and magnesium ions exchanged with sodium ions.
• Ion Exchange Resin Method: Resins replace hardness-producing ions – produces very soft water.
• Distillation: Water vaporized and condensed – used in laboratory.

Importance of Softening Water: Prevents scaling in pipes/boilers, improves soap efficiency, better for domestic and industrial use.

🌾 Types of Hazards

A. Physical Hazards

• Heat and sun exposure → heat exhaustion, heat stroke, dehydration
• Machinery injuries (tractor accidents, tool cuts) → fractures, disability

B. Chemical Hazards

• Pesticides, fertilizers, herbicides → poisoning, skin irritation, respiratory problems, cancer risk

C. Biological Hazards

• Animal waste, insects, fungi, bacteria → tetanus, leptospirosis, malaria

🛡️ Preventive Measures

• Use of PPE (gloves, boots, masks)
• Safe pesticide handling (proper storage and spraying)
• Mechanization safety – training in equipment handling
• Health education about occupational risks
• Regular health check-ups for early disease detection

⚠️ Other Hazards

• Dust Hazards: Grain/soil dust → asthma, allergies, chronic lung disease
• Ergonomic Hazards: Heavy lifting, repetitive bending → back pain, joint disorders
• Psychological Hazards: Financial stress, long hours → mental anxiety

🛡️ 1. Mitigation

Measures to reduce impact before disaster occurs.

• Building earthquake-resistant houses
• Flood control measures
• Afforestation
• Enforcement of safety laws

Objective: Reduce loss of life and property.

📋 2. Preparedness

Planning and preparation before disaster.

• Disaster drills, emergency planning
• Training of personnel
• Stocking food, medicine, rescue materials
• Early warning systems

Objective: Ensure quick and effective response.

🚨 3. Response

Immediate actions during and after disaster.

• Rescue operations, first aid
• Evacuation, shelter arrangement
• Food and water supply

Objective: Save lives and reduce suffering.

🏗️ 4. Recovery

Restoration of normal life after disaster.

• Rehabilitation, reconstruction of houses/roads
• Psychological support
• Economic assistance

Objective: Return community to normal functioning.