Environmental Health

1(a) Sequential Steps of Collection of Water Samples for Surveillance Purpose

A. Collection of Water Sample from a Tap

1. Selection of Sampling Point – Choose clean tap directly connected to supply line; avoid leaking/rusty taps.
2. Cleaning of Tap – Remove attachments, clean mouth of tap properly.
3. Sterilization – Sterilize tap outlet using flame (spirit lamp/alcohol cotton) or disinfectant solution.
4. Allow Water to Flow – Open tap fully, let water run for 2–3 minutes to remove stagnant water.
5. Collection of Sample – Use sterile glass/plastic bottle (250 mL). Do not touch mouth or inside of bottle/cap. Fill leaving small air space.
6. Addition of Sodium Thiosulphate – For chlorinated water, add to neutralize chlorine.
7. Labeling – Mention date, time, place, source, collector’s name.
8. Transportation – Send to lab within 2–6 hours, keep cool (4°C).

B. Collection of Water Sample from a River

1. Selection of Sampling Site – Representative area, avoid edges or stagnant zones.
2. Use Sterile Bottle – Sterilized bottle with stopper.
3. Collection Technique – Hold bottle near base, dip facing upstream, collect 20–30 cm below surface.
4. Avoid Contamination – Do not touch inner side; avoid disturbing bottom sediments.
5. Leave Air Space – For mixing before testing.
6. Labeling – River name, location, time/date, weather condition.
7. Preservation and Transport – Ice box, rapid transport to lab.

1(b) Major Components of Swachh Bharat Mission-Gramin (SBM-G)

Goal: Eliminate open defecation, improve rural sanitation, ensure safe waste disposal.

2(a) Mercury Hot Spots

Definition: Areas with very high mercury contamination in air, water or soil due to industrial/mining activities.

Sources: Coal-fired power plants, gold mining, battery industries, thermometer manufacturing, chemical industries.

Health Effects: Affects nervous system, kidneys, brain development; symptoms: tremors, memory loss, vision problems, developmental defects.

Environmental Effects: Bioaccumulation in fish, biomagnification through food chain.

Prevention: Proper industrial waste disposal, monitoring mercury emission, ban on mercury-containing products.

2(b) Flash Flood and its Effects

Definition: Sudden flooding within short period after intense rainfall, dam failure or cloudburst.

Other Effects: Soil erosion, crop destruction, house/bridge damage, displacement of population.

Prevention: Early warning systems, proper drainage, afforestation, disaster preparedness.

2(c) Artificial Ventilation

Definition: Process of supplying and removing air mechanically from a room or building.

Objectives: Maintain air quality, remove heat/dust/odors, provide comfort.

Types

• Exhaust Ventilation: Removes foul air from room.
• Plenum Ventilation: Fresh air forced into room.
• Balanced Ventilation: Equal air supply and exhaust.
• Air Conditioning: Controls temperature, humidity and purity.

Advantages: Better indoor air quality, prevents infection spread, improves comfort/productivity.
Disadvantages: Expensive, requires maintenance, electricity dependent.

2(d) Dean’s Index

Definition: Used to measure severity of dental fluorosis caused by excess fluoride.

Importance: Assess fluoride toxicity, community dental surveys, guides fluorosis prevention programs.

3(a) Occupational Health Hazards of Stone Crusher Industry Workers

3(b) Strategies to Prevent Air Pollution at National and Individual Level

4(a) “Cooling Power is not a Perfect Index to Measure Thermal Comfort” – Justify

Cooling Power: Measures rate of heat loss from body under environmental conditions.

Why not perfect:

• Ignores Humidity: Thermal comfort greatly depends on humidity.
• Individual Variation: Comfort differs with age, clothing, health status.
• Psychological Factors: Mental condition affects comfort sensation.
• Air Movement Variation: Different air speeds alter heat loss.
• Does not measure total comfort: Temperature, humidity, radiation, air velocity all matter.

Conclusion: Cooling power alone is insufficient for assessing thermal comfort.

4(b) “Segregation is the First and Most Important Step of Biomedical Waste Management” – Justify

• Prevents mixing of waste: Separates infectious and non-infectious waste.
• Reduces infection risk: Protects health workers, patients, waste handlers.
• Facilitates proper disposal: Different wastes need different treatment methods.
• Reduces cost: Less infectious waste = lower treatment cost.
• Environmental protection: Prevents pollution and improper disposal.

Method: Color-coded bins – Yellow, Red, White, Blue as per BMW Rules.

4(c) “Sanitary Latrines are not always Water Sealed” – Justify

Sanitary latrine definition: Prevents human contact with excreta and fly breeding.

Non-water-seal sanitary latrines: Bore-hole latrine, pit latrine, compost latrine.

Why still sanitary: Prevent contamination, reduce fly breeding, ensure safe excreta disposal.

Conclusion: Water seal is desirable but not mandatory for a latrine to be sanitary.

4(d) “Disaster Management is an Example of Intersectoral Coordination” – Justify

Importance: Faster response, efficient resource utilization, better rehabilitation, reduced mortality & morbidity.