Environmental Pollution: Meaning, Causes, Types

Environmental pollution includes Water pollution, Air pollution, Soil pollution and Other types of pollution caused by artificial or man made sources like agricultural, industrial and waste disposal  etc. It impacts human health, ecosystems, and the overall well-being of our planet. Environmental Pollution has emerged as one of the most pressing challenges of the 21st century. Skyglow or light pollution affects 80% of the world’s population, it obscures stars, disrupts nocturnal ecosystems of birds and human health too.

It can also be defined as the introduction of harmful substances like sulfur dioxide, carbon dioxide or pollutants such as black carbon, mercury, particulate matter  into the natural environment such as air, water, and soil causes adverse environmental changes that degrade ecosystems, reduce biodiversity, and threaten human health by causing diseases like cancer and respiratory issues.

Some Historical “Weird” Pollution Facts such as The Lake of Death: Lake Karachay in Russia is often called the most polluted place on Earth. Nutrient-heavy eutrophication suffocates oceans while “forever chemicals” (PFAS) infiltrate our biology. Black carbon particles cover glaciers which results in the loss of albedo effect and transforms ice into a material that absorbs heat. We’re essentially seasoning our planet with toxic persistence and accelerated melting.

• The meaning of Environmental Pollution refers to the introduction of harmful materials into the environment or harmful substances that negatively impact living organisms and natural processes.
• In other words, environmental pollution is the contamination of the physical and biological components of the environment to such an extent that normal environmental processes are adversely affected.

• Any harmful material that, by getting introduced into the environment, causes environmental pollution is called a pollutant.
• In other words, a pollutant is any substance that contaminates air, water, soil, etc, and damages their quality.
• Pollutants can be natural, such as volcanic ash, or created by human activity, such as trash, industrial pollution or factory runoff.

Pollutants can be categorised into various types based on different parameters, as shown below.

Based on the nature of disposal, pollutants are of the following two types:

Non-Biodegradable Pollutants

• Pollutants that cannot be broken down into simpler, harmless substances in nature are called non-biodegradable pollutants.
• For example, DDT, plastics, polythene, insecticides, pesticides, mercury, lead, arsenic, aluminium cans, synthetic fibres, glass objects, iron products, silver foils, etc.
• Through bioaccumulation and biomagnification, these pollutants may appear in greater concentration as we move along the higher tropics of the food chain.

Biodegradable Pollutants

• Biodegradable Pollutants can be broken down into simpler, harmless substances in nature over time.
• For example, domestic wastes, urine, faecal matter, sewage, agriculture residues, paper, wood, cloth, cattle dung, animal bones, Biomedical waste, leather, wool, vegetable stuff or plants etc. if treated correctly.

Depending upon the form in which they persist after being released into the environment, the pollutants are categorised into the following two types:

Primary Pollutants

• Primary Pollutants are those emitted directly from the source and persist in the environment in the form in which they were added.
• Examples: ash, smoke, fumes, dust, nitric oxide, sulphur dioxide, hydrocarbons, etc.

Secondary Pollutants

• Secondary Pollutants are formed from primary pollutants by chemical interaction with some constituents present in the atmosphere.
• Examples are Sulphur trioxide, nitrogen dioxide, aldehydes, ketones, ozone, Acid rain etc.

Depending upon their existence in nature, pollutants are of the following two types:

Quantitative Pollutants

• These substances normally occur in the environment but acquire the status of pollutant when their concentration increases due to human unmindfulness.
• For example, Carbon Dioxide (CO2), one of the primary Greenhouse gases.

Qualitative Pollutants

• These substances do not usually occur in nature but are added by man.
• For example, insecticides.

The causes are based on the following factors:

• Rapid Industrialisation
  • The concentration of industries in urban areas releases Industrial pollution into the air, water, and soil, causing environmental pollution.
  • The rapid pace of urbanisation also increases waste generation and resource consumption, exacerbating pollution and causing severe effects.
  • Industries also generate hazardous wastes in many forms, including liquids, solids, gases, biomedical waste and sludge.
• Rapid Urbanization
  • The increased pace of urbanisation in recent times has led to worsening pollution.
  • It creates issues such as deforestation and habitat loss, increased emissions and waste generation, etc.
  • Increased waste and vehicular density contribute significantly to the sources of air pollution.
• Forest Fires
  • The frequency of forest fires or wildfires has increased because of human actions, such as land clearing, encroachment, etc.
  • These wildfires are a huge source of pollution, adding large amounts of gaseous and other pollutants to the environment.
• Improper Agricultural Practices
  • According to the IPCC report, the agriculture sector produces at least 23 per cent of global greenhouse gas emissions (second only to the energy sector).
  • Using chemical fertilisers, pesticides, and herbicides in agriculture contributes to soil and water pollution and environmental pollution.
  • Intensive farming practices also lead to deforestation, soil erosion, habitat destruction and environmental pollution.
• Deforestation
  • Deforestation refers to the decrease in forest areas worldwide that are lost for other uses, such as agricultural croplands, urbanisation, or mining activities.
  • This causes an imbalance in the local ecology and reduces nature’s capability to absorb pollutants, leading to pollution.
• Other Causes
  • Other prominent causes include continued reliance on fossil fuels, vehicular emissions, and improper waste management.

• Environmental pollution and its types can be categorised into several types based on the nature of the pollutants and the media they affect.
• Some of the major types of environmental pollution are described below.

• Air pollution is the contamination of the air with harmful components that can have negative impacts on human health, the environment, and even weather conditions.
• Air pollution happens because of emission of harmful gases and dust particles into the air.
• Air pollution causes diseases such as respiratory disorders and heart disease, and other global issues including acid rain and climate change.

• Water Pollution is described as the introduction of harmful substances to water resources like rivers, lakes, and seas through pollution from various sources like factories, sewage, farm waste, and oil spills.
• Water Pollution happens through pollution of the water resources, which causes deterioration of the quality of water.
• Sources of Water Pollution include Industrial effluents, agricultural run-off, and domestic sewage cause Water Pollution.
• Water pollution creates adverse effects on the life of the aquatic system and humans as well; for instance, pollution with nutrients leads to eutrophication causing excessive growth of algae.

• Soil Pollution refers to soil contamination with harmful substances, including heavy metals, pesticides, and industrial waste.
• Major sources of soil pollution include – the deposition of hazardous chemicals, heavy metals, and waste on land.
• Major types of Soil pollution include chemical pollution (fertilisers, pesticides), Industrial waste pollution, and Solid waste pollution etc.
• Soil pollution reduces soil fertility, contaminates crops, and affects food security.

• Noise Pollution refers to excessive noise that can adversely affect human health and wildlife.
• Significant contributors to noise pollution include noise from industrial activities, traffic, construction, and urbanisation.
• Chronic exposure to high noise levels can lead to hearing loss, stress, and other health issues, which in turn can lead to environmental pollution.

• Thermal Pollution is defined as the sudden increase or decrease in the temperature of a natural body of water, such as an ocean, lake, river, or pond.
• This sudden change in water temperature is mainly due to anthropogenic activities.
• For example, a power plant takes water from a source, such as a river, as a coolant and then discharges the warm water back into the water body.
• Thermal Pollution leads to several issues in the aquatic ecosystem, such as decreased Dissolved Oxygen (DO) levels, algae growth, and a surge in toxins.

• Nuclear Pollution or Radiation Pollution can be defined as the release of high-energy particles into the air, water or surface. It damages genetic material and causes long-term health effects.
• It is caused by radioactive materials contaminating the environment by decaying natural or anthropogenic activities.
• Breaches at nuclear power plants, scientific laboratories, chemical spills, etc, are some of the prominent causes of Nuclear Pollution or Radiation Pollution.
• Radiation modifies and destroys cells and genetic materials in living organisms, resulting in ill impacts on health.

• Marine Pollution can be defined as the introduction of substances to the marine environment directly or indirectly by humans, resulting in adverse effects such as hazards to human health, obstruction of marine activities and lowering the quality of seawater.
• Waste and sewage from different sources, such as industries, residences, etc, are directly discharged into the sea and are the primary sources of marine and environmental pollution.
• It affects the flora and fauna of the marine environment.

• Plastic pollution is the contamination of the environment with plastic waste, such as discarded plastic items and debris.
• Plastic pollution is a major environmental problem because it takes hundreds of years for plastic to decompose.
• Plastic wastes can accumulate in landfills, waterways, and oceans, causing harm to wildlife and ecosystems.
• The impact of plastic pollution includes harm to marine life, soil degradation, and entry into food chains (microplastics). On the other hand poor plastic waste management worsens the situation.

• Light Pollution refers to excessive artificial light that can disrupt ecosystems and nocturnal activities.
• The Effects of light pollution include disturbance to wildlife, sleep disorders in humans, and interference with astronomical observations. 
• It contributes to energy waste and interferes with astronomical observations.

There are various consequences of environmental pollution as follows:

• Public Health
  • Pollution is a major factor contributing to illnesses and early deaths across the globe.
  • Different forms of pollution impact human health differently.
  • Air pollution, for example, is directly responsible for millions of deaths each year, mostly affecting children and the old generation.
• Environmental Degradation
  • Pollution affects ecosystems through destruction of biodiversity and natural environments, among other things.
  • These contribute to problems like disruption of food chains and environmental pollution.
• Climate Change
  • Pollution is a major cause of climate change, especially through greenhouse gas emissions.
  • This contributes to problems like global warming, harsh weather conditions, melting ice caps and shifting of ecosystems.
• Economic Consequences
  • Pollution has very high economic costs involving lost productivity and damage to ecosystems.
  • Costs associated with environmental pollution regulation and increased healthcare costs further contribute to the cost of pollution.

In order to minimise the impacts of pollution or environmental pollution, a more holistic and multifaceted approach needs to be taken, such as:

• Policy & Regulations: Governments need to enact tough environmental policies that will reduce the emissions, control the wastes, and encourage sustainable practices. Enactment of tough vehicle emission norms and encouragement to National Clean Air Program.
• Awareness and Education: It is very important to fight pollution through the education of the general population on the causes and impacts of pollution. Encouraging the general populace to adopt practices that are good for the environment.
• Practices of the Circular Economy: In which there is the emphasis on recycling of resources need to be encouraged.
• Technological Advances: The innovations in clean energy and pollution controls will ensure that the impact of human activities on the environment is reduced. This can help in reducing the greenhouse gases.
• International Collaboration: Environmental pollution is an international issue. Hence, international collaboration through conventions and treaties becomes extremely important for tackling environmental pollution.
• Waste Management: Proper management of plastic wastes and biomedical waste.

Which city of India is most polluted?

According to real-time AQI data, Delhi tops the list of India’s most polluted cities.

What are the primary pollutants?

Primary Pollutants are the pollutants that emit directly from the source and persist in the environment in the form in which they were added.

What is a microplastic?

Microplastic is the plastic particles smaller than 5 mm.