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Environment and Health - Community Medicine

Based on Park's Textbook of Preventive and Social Medicine

1. Introduction

It was Hippocrates who first related disease to the environment - noting the role of climate, water, and air in causing illness. Centuries later, Pettenkofer in Germany revived the concept of the disease-environment association. Today, environment and health is one of the foundational chapters of community medicine because environmental factors profoundly shape population health.

2. Classification of Environment

The environment of man is broadly classified into two types:

A. Internal Environment

Pertains to every component part, tissue, organ, and organ system and their harmonious functioning within the body. This is the domain of internal medicine.

B. External (Macro) Environment

Defined as "all that which is external to the individual human host". It encompasses:

Micro-environment (domestic/personal environment): The individual's lifestyle, eating habits, smoking, drinking, drug use, etc.
Physical environment: Non-living things and physical factors (air, water, soil, housing, climate, heat, light, noise, radiation).
Biological environment: All living organisms surrounding man - viruses, bacteria, insects, rodents, animals and plants.
Psychosocial environment: Cultural values, customs, habits, beliefs, attitudes, morals, family structure, social relationships, and economic conditions.

Other recognized sub-categories include occupational environment, socio-economic environment, and moral environment.

3. Components of External Environment

A. Physical Environment

Applied to non-living things and physical factors including air, water, soil, housing, climate, geography, heat, light, noise, debris, and radiation with which man is in constant interaction.

Man's progress over his physical environment has been responsible for most health improvements over the last century. However, in doing so, he has created new health problems such as:

Air pollution
Water pollution
Noise pollution
Urbanization
Radiation hazards
Electromagnetic exposure from telecommunications and broadcasting

In most developing countries, defective physical environment (lack of sanitation) remains the main health problem.

B. Biological Environment

The universe of living things surrounding man, including:

Viruses and microbial agents
Insects (vectors), rodents, animals, and plants

These organisms act as disease-producing agents, reservoirs of infection, intermediate hosts and vectors. When the ecological balance between host and these organisms is disturbed, ill-health results.

C. Psychosocial Environment

Includes complex psychosocial factors defined as "those factors affecting personal health, health care and community well-being that stem from the psychosocial make-up of individuals and the structure and functions of social groups."

Covers:

Cultural values, customs, habits, beliefs, attitudes
Family structure and community networks
Social and economic support systems
Organization of health and welfare services

4. Environment as a Determinant of Health

Environment is recognized as the third major determinant of health (after genetic/hereditary factors and lifestyle):

"It is an established fact that environment has a direct impact on the physical, mental and social well-being of those living in it."

Park's Textbook of Preventive and Social Medicine

Environmental factors range from:

Housing and water supply
Psychosocial stress and family structure
Social and economic support systems
Organization of health and social welfare services

The physical, biological, and psychological components are not watertight compartments - they are inextricably linked and must be viewed holistically when considering environmental influence on health.

5. Air Pollution

Definition

Air pollution is the presence of substances in the atmosphere that cause harm to human health, other living organisms, or the environment.

Major Air Pollutants

Pollutant	Sources	Health Effects
Particulate Matter (PM2.5/PM10)	Vehicles, industry, power plants, domestic coal burning	Respiratory and cardiovascular disease, lung cancer
Sulphur dioxide (SO₂)	Fossil fuels, industrial processes	Respiratory irritation, acid rain
Nitrogen dioxide (NO₂)	Motor vehicles, combustion	Respiratory disease
Carbon monoxide (CO)	Incomplete combustion	Hypoxia, cardiac effects
Lead	Leaded fuel, smelting	Neurotoxicity (especially children - IQ loss, behavioural issues)
Ozone (O₃)	Secondary pollutant (photochemical)	Respiratory irritation
Polycyclic Aromatic Hydrocarbons (PAH)	Combustion, vehicles	Carcinogenic

Particulate Matter - Key Facts

PM10: particles < 10 µm; penetrate to thoracic region
PM2.5: particles < 2.5 µm; deposit in smaller airways and alveoli - more dangerous
WHO AQG (2005): PM2.5 annual mean = 10 µg/m³; 24-hour mean = 25 µg/m³
PM10 annual mean = 20 µg/m³; 24-hour mean = 50 µg/m³
No safe threshold for PM has been identified

Health Effects of Air Pollution

(a) Immediate/Acute Effects:

Borne mainly by the respiratory system
Acute bronchitis
In extreme pollution events - death by suffocation (e.g., London Smog Disaster, 1952)

(b) Delayed/Chronic Effects:

Chronic bronchitis
Lung cancer
Bronchial asthma
Emphysema
Respiratory allergies
Cardiovascular diseases
Neurological effects (from lead)

(c) Environmental Effects:

Acid rain
Climate change
Ecosystem damage

"Mortality in cities with high pollution levels exceeds that in relatively cleaner cities by 15-20%." - Park's Textbook

Indoor Air Pollution

The indoor environment is a critical microenvironment where people spend the majority of their time. Indoor air pollution originates from both outdoor and indoor sources:

Major indoor sources worldwide:

Combustion of solid fuels (wood, coal, dung) on open fires or traditional stoves
Tobacco smoke
Building materials (asbestos, formaldehyde)
Radon from soil
Biological contaminants (mold, dust mites)

Health consequences:

Acute lower respiratory infections in young children
Chronic Obstructive Pulmonary Disease (COPD) in adults
Lung cancer

6. Water and Health

Water-Related Diseases Classified by Mode

Category	Examples
Waterborne diseases (contaminants in drinking water)	Cholera, typhoid, hepatitis A, dysentery, polio
Water-washed diseases (inadequate water for hygiene)	Shigellosis, trachoma, conjunctivitis, scabies, ascariasis
Water-based diseases (host in water)	Schistosomiasis, Guinea worm (dracunculiasis)
Water-related insect vector diseases	Malaria, filariasis, arboviral diseases, onchocerciasis, African trypanosomiasis

Chemical Contamination of Water

Fluoride at 1 mg/L: Protective against dental caries
Excess fluoride: Dental fluorosis (mottled enamel), skeletal fluorosis
Nitrates: Cause methaemoglobinaemia in infants (cyanosis)
Hard water (Ca/Mg): Appears to have a beneficial effect against cardiovascular diseases
Heavy metals (lead, arsenic, mercury): Neurotoxic, carcinogenic at high levels

Water Pollution Law - India

The Water (Prevention and Control of Pollution) Act, 1974 provides for:

Central and State Water Boards with wide powers to control pollution
Legal deterrents against water contamination

7. Housing and Health

Housing is part of the total environment and directly influences health and well-being. Poor housing is strongly associated with:

Respiratory infections: Tuberculosis, common cold, influenza, diphtheria, bronchitis, measles, whooping cough
Skin infections: Scabies, ringworm, impetigo, leprosy
Rat infestation: Plague
Arthropods: Houseflies, mosquitoes, fleas, bugs (vectors of disease)
Accidents: A substantial proportion of domestic accidents are due to environmental defects in the home
High morbidity and mortality: Observed where housing conditions are sub-standard
Psychosocial effects: Sense of isolation, neurosis, and behaviour disorders - particularly in high-rise dwellers and densely populated urban areas

Overcrowding

Overcrowding occurs when more people live in a dwelling than space allows, making movement restricted, privacy impossible, hygiene impractical, and rest difficult.

Health effects:

Rapid spread of respiratory infections (TB, influenza, diphtheria)
High morbidity and mortality
Psychosocial harms: irritability, frustration, lack of sleep, anxiety, violence, mental disorders

Accepted standard: Expressed as persons per room (number of persons divided by number of rooms). WHO recommends no more than 1.5 persons per room as the threshold for overcrowding.

8. Environmental Sanitation

Environmental sanitation refers to the control of all environmental factors that may exercise a deleterious effect on physical, mental, or social well-being. Key components:

Excreta Disposal

Improper excreta disposal leads to:

Soil pollution
Water pollution
Contamination of food
Propagation of flies

Resulting diseases: typhoid, paratyphoid fevers, cholera, dysentery, hepatitis, helminthiasis

Solid Waste Management

Poor solid waste management promotes:

Rodent and insect breeding
Soil and water pollution
Aesthetic deterioration of the community

Noise Pollution

Noise is recognized as a physical environmental pollutant. Effects include:

Hearing impairment (especially industrial workers)
Sleep disturbance
Cardiovascular stress
Psychological effects (annoyance, anxiety)

Radiation Hazards

Ionizing radiation (X-rays, nuclear): Cancers, genetic mutations
Non-ionizing radiation (UV, microwave): Skin cancer, cataracts, thermal effects

9. Socioeconomic Environment and Health

Socioeconomic conditions are long-recognized influencers of health. Major factors:

Economic status: Per capita GNP determines purchasing power, standard of living, and disease patterns. Paradoxically, affluence contributes to coronary heart disease, diabetes, and obesity.
Education: Especially female education - closely linked to infant/child mortality reduction. Kerala (India) demonstrates that education compensates poverty's health effects.
Nutrition: Closely tied to environment - food production, contamination, and distribution are all environmentally determined.
Employment/Occupation: Occupational environment introduces specific health hazards (chemicals, dust, ergonomic stress).

10. Occupational Environment

The occupational environment introduces specific physical, chemical, biological, and ergonomic hazards. India's National Programme for Control and Treatment of Occupational Diseases addresses this. Key occupational hazards include:

Dust: Pneumoconiosis (silicosis, coal worker's pneumoconiosis)
Chemicals: Pesticide poisoning, heavy metal toxicity
Noise: Noise-induced hearing loss
Heat: Heat stroke, heat exhaustion
Radiation: Radiation sickness, cancers

11. Control and Prevention Strategies

Air Quality

Legislative controls (Clean Air Acts)
Motor vehicle emission standards
Industrial emission controls
WHO Air Quality Guidelines
Promotion of clean cooking fuels

Water Safety

Water treatment (filtration, chlorination, UV)
Source protection
Legal frameworks (Water Pollution Act 1974)

Housing Improvement

Building codes and standards
Urban planning and slum improvement
Provision of basic amenities (ventilation, sanitation)

Environmental Health Legislation (India)

Environment Protection Act, 1986
Air (Prevention and Control of Pollution) Act, 1981
Water (Prevention and Control of Pollution) Act, 1974
Solid Waste Management Rules
Noise Pollution Control Rules

12. Summary: Key Concepts

Concept	Detail
Internal environment	Organ systems; domain of internal medicine
External environment	Physical + Biological + Psychosocial
3 components of external env.	Physical, Biological, Psychosocial
Air pollution immediate effect	Acute bronchitis, suffocation
Air pollution delayed effects	Chronic bronchitis, lung cancer, asthma, emphysema
PM2.5	< 2.5 µm; most dangerous; reaches alveoli
WHO PM2.5 annual limit	10 µg/m³
Indoor pollution main cause	Solid fuel combustion
Water and fluoride	1 mg/L = protective; excess = fluorosis
Nitrates in water	Methaemoglobinaemia in infants
Overcrowding main disease	Tuberculosis and respiratory infections
London smog	1952 - extreme acute air pollution event

Sources: Park's Textbook of Preventive and Social Medicine - Chapters on Concept of Health, Environment and Health, Air Pollution, Water Pollution, Housing and Health, Environmental Sanitation

causes of all pollution dispose mangemnt of community medicine

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Causes of All Types of Pollution and Their Disposal/Management - Community Medicine

Based on Park's Textbook of Preventive and Social Medicine

OVERVIEW

The phenomenon called "pollution" is an inescapable consequence of the presence of man and his activities. Much of man's ill-health can be traced to adverse environmental factors such as air pollution, water pollution, soil pollution, noise pollution, and poor sanitation. The major types of pollution recognized in community medicine are:

Air Pollution
Water Pollution
Soil Pollution (Excreta/Refuse)
Noise Pollution
Radiation Pollution

1. AIR POLLUTION

Definition

Air pollution signifies the presence in the ambient (surrounding) atmosphere of substances (gases, mixtures of gases, and particulate matter) generated by the activities of man in concentrations that interfere with human health, safety or comfort, or that are injurious to vegetation, animals, and other environmental media.

Types of Air Pollutants

A. Primary Air Pollutants - emitted directly into the atmosphere from a source such as a factory chimney or exhaust pipe (e.g., SO₂, CO, soot, lead particles).

B. Secondary Air Pollutants - formed within the atmosphere from chemical reactions of primary pollutants with oxygen and water. The most familiar example is ozone (O₃), which arises almost entirely from chemical reactions in the atmosphere.

C. Gaseous Air Pollutants - present as gases or vapours capable of passing through filters. If water-soluble, they deposit in the upper respiratory tract. If insoluble, they penetrate to the deep lung.

D. Particulate Air Pollutants - solid or liquid phase material suspended in the atmosphere, ranging from 1-100 µm in diameter.

Causes / Sources of Air Pollution

Pollutant	Sources
Carbon monoxide (CO)	Incomplete combustion in automobiles, industrial processes, heating facilities, incinerators. Peaks during morning and evening rush hours.
Sulphur dioxide (SO₂)	Combustion of sulphur-containing fossil fuels, smelting of ores, power plants, oil refineries, kerosene heaters
Oxides of Nitrogen (NOₓ)	Automobile exhaust, gas stoves and heaters, wood-burning stoves, kerosene heaters
Lead	Automobile exhaust (leaded gasoline), smelting, recycling of lead, leaded paint stripping, leaded aviation fuel
Particulate Matter (PM2.5/PM10)	Power plants, industrial processes, vehicular traffic, domestic coal burning, incinerators, dust storms
Hydrocarbons/PAH	Automobile exhaust, cigarette smoke, combustion processes
Ozone (O₃)	Secondary pollutant from automobile exhaust photochemical reactions
Asbestos, beryllium, mercury	Industrial and mining operations
Hydrogen sulphide, ammonia	Industrial processes, sewage, agricultural activities
Radioactive compounds	Nuclear power plants, weapons testing
Indoor sources	Solid fuel combustion (wood, coal, dung), tobacco smoke, building materials (formaldehyde, asbestos), radon

Health Effects

(a) Health Aspects:

Immediate/Acute: Acute bronchitis, respiratory irritation; in extreme cases - death by suffocation (London Smog Disaster, 1952)
Delayed/Chronic: Chronic bronchitis, lung cancer, bronchial asthma, emphysema, respiratory allergies
SO₂ causes coughing, mucus secretion, aggravates asthma and COPD
Lead causes impaired neuropsychological development in children (IQ loss, poor school performance, behavioural difficulties)
NOₓ causes bronchiolitis obliterans, impaired lung defences
PM2.5 increases cardiovascular and respiratory disease risk
Epidemiological studies show sudden increases in air pollution are associated with immediate increases in morbidity and mortality

(b) Social and Economic Aspects:

Destruction of plant and animal life
Corrosion of metals, damage to buildings
Reduced visibility in towns
Acid rain causing deforestation (SO₂ + water = H₂SO₄)

Prevention and Control of Air Pollution (WHO Recommended)

Containment - Prevent escape of toxic substances into ambient air through enclosure, ventilation, and air-cleaning "arresters"
Replacement - Replace polluting technology with cleaner alternatives (electricity, solar power, natural gas, central heating instead of coal; unleaded petrol)
Dilution - Valid within the self-cleaning capacity of the environment. Establish green belts between industrial and residential areas
Legislation - Air (Prevention and Control of Pollution) Act, 1981 (India); WHO Air Quality Guidelines
Vehicle emission standards - Catalytic converters, PUC certificates
Use of clean fuels - LPG, CNG for domestic cooking and transport
Air purification - HEPA filters, UV irradiation (operation theatres, infectious disease wards), chemical mists (triethylene glycol vapours)

2. WATER POLLUTION

Definition

Pure uncontaminated water does not occur in nature. Water pollution is the contamination of water beyond its natural self-purification capacity by human activities that makes it unsafe for use.

Causes / Sources of Water Pollution

A. Natural Sources (not essentially dangerous):

Dissolved gases (CO₂, H₂S, N₂ from rainfall)
Dissolved minerals (calcium, magnesium, sodium salts from soil)
Suspended impurities (clay, silt, sand, mud)
Microscopic organisms (derived from atmosphere, catchment area, soil)

B. Man-Made Sources (serious public health hazard):

Source	Nature of Pollution
Sewage	Decomposable organic matter and pathogenic agents (bacteria, viruses, protozoa, helminths)
Industrial and trade wastes	Toxic agents - metal salts, complex synthetic organic chemicals, heavy metals (lead, mercury, arsenic, chromium)
Agricultural pollutants	Fertilizers (nitrates, phosphates) and pesticides
Thermal pollution (heat)	Cooling water from power plants raises water temperature, depletes dissolved oxygen
Radioactive substances	Nuclear power plant discharges, medical and industrial radioactive waste
Pipeline corrosion and leaky joints	Cross-connections between water supply and sewage pipes cause contamination even after treatment

Indicators of water pollution: Total suspended solids, Biochemical Oxygen Demand (BOD) at 20°C, concentration of chlorides, nitrogen and phosphorus, absence of dissolved oxygen.

Water-Related Diseases

A. Biological (Waterborne diseases):

Viral: Hepatitis A, Hepatitis E, poliomyelitis, rotavirus diarrhoea
Bacterial: Typhoid, paratyphoid fever, bacillary dysentery, E. coli diarrhoea, cholera
Protozoal: Amoebiasis, giardiasis
Helminthic: Roundworm, threadworm, hydatid disease
Leptospiral: Weil's disease

B. Water-Washed Diseases (insufficient water for hygiene):

Shigellosis, trachoma, conjunctivitis, scabies, ascariasis

C. Water-Based Diseases (host lives in water):

Schistosomiasis, Guinea worm (dracunculiasis)

D. Water-Related Insect Vector Diseases:

Malaria, filariasis, arboviral diseases, onchocerciasis, African trypanosomiasis

E. Chemical Effects:

High fluoride = dental/skeletal fluorosis
High nitrates = methaemoglobinaemia in infants (cyanosis)
Hard water = protective against cardiovascular diseases

Management / Control of Water Pollution

Legislation: Water (Prevention and Control of Pollution) Act, 1974 - Central and State Water Boards with enforcement powers
Treatment of water supply (large scale):
- Sedimentation (plain and with coagulants - alum)
- Filtration (slow sand filters, rapid sand filters)
- Disinfection - Chlorination (most practical), UV irradiation, ozonation, boiling
Treatment of water (small scale):
- Boiling, chlorination with bleaching powder, solar disinfection
Source protection: Safe well construction, sanitary surveying, sealing of well tops
Sewage treatment before discharge into water bodies (primary, secondary, tertiary treatment)
Industrial effluent treatment before release
Surveillance at every point in distribution system

3. SOIL POLLUTION AND EXCRETA DISPOSAL

Public Health Importance of Excreta

Human excreta is a major source of environmental pollution. Health hazards of improper excreta disposal:

Soil pollution
Water pollution
Contamination of foods
Propagation of flies

Resulting diseases: Typhoid, paratyphoid fever, dysenteries, diarrhoeas, cholera, hookworm disease, ascariasis, viral hepatitis, and other intestinal infections.

Routes of transmission (the 5 Fs): Water, Fingers, Flies, Soil, Food.

4. SOLID WASTE POLLUTION

Definition

Solid wastes include garbage (food wastes), rubbish (paper, plastics, wood, metal, glass), demolition products (bricks, masonry, pipes), sewage sludge, dead animals, and manure.

Per capita daily solid waste produced ranges between 0.25 to 2.5 kg in different countries (varies with dietary habits, lifestyle, urbanization).

Sources of Refuse

Type	Contents
Street refuse	Leaves, straw, paper, animal droppings, litter
Market refuse	Putrid vegetable and animal matter (highly infectious)
Stable litter	Animal droppings, leftover animal feeds
Industrial refuse	Wide variety - inert to highly toxic/explosive compounds
Domestic refuse	Ash (residue from cooking fires), rubbish (paper, cloth, metal, glass), garbage (waste food, vegetable peels)

Health Hazards of Improper Solid Waste Disposal

Decomposition favours fly breeding (disease vectors)
Attracts rodents and vermin (plague, leptospirosis)
Pathogens conveyed to food through flies and dust
Water and soil pollution from drainage/leachate
Unsightly appearance, nuisance from bad odours
Correlation between improper disposal and incidence of vector-borne diseases

Methods of Solid Waste Disposal

(a) Dumping Refuse dumped in low-lying areas for land reclamation. WHO condemned it as "a most insanitary method that creates public health hazards, nuisance and severe pollution". Drawbacks: exposed to flies and rodents, water and soil pollution, wind dispersal, odour.

(b) Controlled Tipping / Sanitary Landfill (Most satisfactory method) Refuse is placed in a prepared trench, compacted, and covered with earth at the end of each working day. Three methods:

Trench method - level ground; 2-3 m deep, 4-12 m wide trench
Ramp method - sloping terrain
Area method - filling land depressions, quarries, clay pits; each layer sealed with 30 cm mud cover

(c) Incineration Burning of refuse at high temperatures. Advantages: complete destruction, reduces volume significantly, can generate energy. Used for hospital/infectious waste. Needs proper emission controls to prevent air pollution.

(d) Composting Biological decomposition of organic matter into humus/manure.

Bangalore method (NEERI method): Organic refuse is placed in trenches 2-3 m wide, 1 m deep; covered with earth; decomposed in 4-8 weeks to form compost.
Mechanical composting: Industrial scale - refuse pulverized, mixed with sewage sludge/nightsoil in rotating machines. Controlled carbon-nitrogen ratio, temperature, moisture, pH, and aeration. Complete in 4-6 weeks. Used in Netherlands, Germany, Switzerland, Israel.

(e) Manure Pits (For rural India) Individual householders dig pits and dump garbage, cattle dung, straw, and leaves. Covered with earth daily. Two pits used alternately. Converts to manure in 5-6 months for agricultural use. Effective and simple for rural communities.

(f) Burial (For small camps/disaster situations) Trench 1.5 m wide, 2 m deep; refuse covered with 20-30 cm earth daily. Contents usable as field manure after 4-6 months.

5. EXCRETA DISPOSAL METHODS

In Unsewered Areas

A. Service Type (Conservancy System) Nightsoil collected from bucket/pail latrines by human agency - now condemned as insanitary and inconsistent with human dignity. Nightsoil exposed to flies; risk of water and soil pollution.

B. Non-Service Type (Sanitary Latrines) A sanitary latrine must ensure:

Excreta does not contaminate ground or surface water
Excreta does not pollute soil
Not accessible to flies, rodents, animals
Does not create nuisance from odour or unsightly appearance

Types of Sanitary Latrines:

Type	Features	Suitable For
Bore hole latrine	30-40 cm diameter hole, 4-8 m deep; concrete squatting plate	Family use; forerunner of non-service latrines
Pit privy (VIP latrine)	Ventilated Improved Pit - fly trap using light principle; most recommended for rural India	Rural communities
Pour flush latrine	Pan connected to pit via water seal trap; 2 cm water seal prevents flies and odour	Indian standard latrine
Aqua privy	Tank below the squatting slab filled with water; sewage treated in tank	Semi-urban areas
Septic tank	Underground watertight chamber; anaerobic digestion; liquid effluent to soak pit	Urban households

In Sewered Areas

Municipal sewers carry waste to:

Sewage treatment plants (primary → secondary → tertiary)
Discharge of treated effluent to water bodies

6. NOISE POLLUTION

Definition

Noise is defined as "wrong sound, in the wrong place, at the wrong time." Noise pollution signifies the vast cacophony of sounds produced in modern life leading to health hazards. The 20th century has been described as the "Century of Noise."

Sources / Causes of Noise Pollution

Automobiles, factories, industries, aircraft
Railway junctions, traffic roundabouts, bus terminuses, airports
Pressure horns, loudspeakers during festivities (especially at night)
Domestic sources: radios, transistors, televisions
Industrial machinery and equipment

Properties of Noise

Loudness/Intensity: Measured in decibels (dB)
- Normal conversation = 60-65 dB
- Whispering = 20-30 dB
- Heavy street traffic = 60-80 dB
- Boiler factories = ~120 dB
- Safe daily exposure limit = 85 dB
Frequency: Measured in Hertz (Hz)

Acceptable Noise Levels (dBA)

Setting	Area	Level (dBA)
Residential	Bedroom	25
Residential	Living room	40
Commercial	Office	35-45
Commercial	Conference room	40-45
Industrial	Workshop	40-60
Industrial	Laboratory	40-50

Health Effects of Noise

Auditory effects: Noise-induced hearing loss (NIHL) - most common occupational disease; tinnitus
Non-auditory physiological effects: Hypertension, cardiovascular stress, altered hormonal responses
Psychological effects: Irritability, annoyance, anxiety, frustration, mental disorders
Sleep disturbance and reduced work efficiency
Communication interference causing accidents

Control of Noise Pollution

Source control: Engineering controls - mufflers, enclosures, quieter machinery design
Transmission control: Sound barriers, green belts, distance from sources
Receptor protection: Personal Protective Equipment (PPE) - ear muffs, ear plugs (for occupational exposure)
Legislation: Noise Pollution (Regulation and Control) Rules, 2000 (India); WHO guidelines
Urban planning: Zoning - separation of industrial, commercial, and residential areas
Traffic management: Speed limits, banning pressure horns in hospital/school zones

7. RADIATION POLLUTION

Causes / Sources

Type	Sources
Ionizing radiation	Nuclear power plants, nuclear weapons testing, X-ray equipment (medical), radioactive waste
Non-ionizing radiation	UV radiation (sun), microwave radiation, radar, telecommunications towers, television transmitters, satellite systems

Health Effects

Ionizing: Radiation sickness, cancers (leukaemia, thyroid cancer), genetic mutations, teratogenesis
UV: Skin cancer, cataracts
Microwave/electromagnetic: Thermal effects on tissues (still being evaluated)

Control

Radiation protection standards (distance, shielding, time limits)
Radiation Protection Act
International Commission on Radiological Protection (ICRP) guidelines
Proper disposal of radioactive medical waste

SUMMARY TABLE: All Pollution Types at a Glance

Pollution Type	Key Sources	Major Health Effects	Key Control Measures
Air	Vehicles, industry, coal burning, indoor fuels	Bronchitis, asthma, lung cancer, CVD, lead toxicity	Legislation, clean fuels, green belts, emission standards
Water	Sewage, industrial effluents, agriculture, pipeline leaks	Cholera, typhoid, dysentery, hepatitis, fluorosis	Water treatment, source protection, legislation (1974 Act)
Soil/Excreta	Open defecation, poor sanitation, industrial waste	Typhoid, dysentery, hookworm, cholera, ascariasis	Sanitary latrines, sewage treatment, septic tanks
Solid Waste	Domestic, market, street, industrial refuse	Fly/rodent breeding, soil & water pollution, vector-borne diseases	Sanitary landfill, composting, incineration, manure pits
Noise	Vehicles, industry, aircraft, domestic appliances	Hearing loss, hypertension, sleep disturbance, anxiety	Engineering controls, PPE, legislation, zoning
Radiation	Nuclear plants, X-rays, UV, telecom	Cancer, genetic mutations, skin disease, cataracts	Shielding, distance, time limits, ICRP guidelines

Source: Park's Textbook of Preventive and Social Medicine - Chapters on Environmental Sanitation, Air Pollution, Water Pollution, Disposal of Wastes, Excreta Disposal, and Noise

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