Air Pollution: A Silent Killer – Causes, Health Effects of PM2.5 and Solutions for a Cleaner India

1. Introduction: Air pollution – a growing threat to India's future

Air pollution is one of the most serious environmental and public-health challenges facing India. It affects millions of people every day, irrespective of their age, occupation, economic status or geographical location.

 

The air we breathe is essential for life. However, the increasing concentration of harmful gases, microscopic dust particles, industrial emissions, vehicle exhaust, construction dust, agricultural residue burning and firecracker smoke is making the air unsafe in many Indian cities.

 

Air pollution is no longer just an environmental issue. It is also:

 

• A public-health emergency.
• A threat to children's physical and mental development.
• A risk to pregnant women and unborn babies.
• A major concern for elderly people.
• A cause of reduced worker productivity and lost working days.
• A threat to forests, agriculture, biodiversity and climate stability.

 

An economic burden on families, industries and the healthcare system.

One particularly concerning period in India is October to January. During these months, several regions experience worsening air quality due to changing weather conditions, lower atmospheric mixing, crop-residue burning, increased emissions and festive activities such as Diwali firecrackers.

 

The important point is that India's air pollution problem exists throughout the year. Diwali firecrackers add another concentrated source of pollution to an already polluted atmosphere.

2. History of air pollution and pollution control in India

Air pollution in India did not begin recently. It developed gradually with industrialisation, urbanisation, population growth, transportation and increased consumption of fossil fuels.

Period    Major development:

 

• Before 1950    Smoke from coal, domestic cooking, traditional industries and urban activities was a major source of air pollution.
• 1950–1970    Industrialisation, coal-based power generation and urban population growth increased emissions.
• 1974        Central Pollution Control Board (CPCB) was established under the Water (Prevention and Control of Pollution) Act, 1974.
• 1981        Air (Prevention and Control of Pollution) Act was enacted to prevent and control air pollution.
• 1982        India's first National Ambient Air Quality Standards were adopted by CPCB.
• 1984        National Air Quality Monitoring Programme was initiated.
• 1994        National Ambient Air Quality Standards were notified.
• 2009        Revised National Ambient Air Quality Standards were notified, covering 12 pollutants.
• 2015        India's National Air Quality Index (AQI) was launched.
• 2019        National Clean Air Programme (NCAP) was launched to improve air quality in polluted cities.
• 2020        Bharat Stage VI vehicle emission standards were implemented nationwide.
• 2021        Commission for Air Quality Management (CAQM) was established for Delhi-NCR and adjoining areas.
• 2026        Further strengthening of monitoring networks and industrial emission controls is underway.

Important Indian environmental laws:

 

1. Air (Prevention and Control of Pollution) Act, 1981

This legislation provides the legal framework for preventing, controlling and reducing air pollution.

2. Environment (Protection) Act, 1986

This Act provides broad powers to the Central Government to protect and improve environmental quality.

3. National Ambient Air Quality Standards, 2009

These standards define permissible ambient concentrations for important air pollutants.

4. National Clean Air Programme, 2019

NCAP focuses on reducing particulate pollution through coordinated action by central, state and local authorities.

5. Commission for Air Quality Management Act, 2021

This provides a coordinated institutional framework for managing air pollution in Delhi-NCR and adjoining areas.

 

India faces several different sources of air pollution. Their relative contribution changes depending on the city, season, weather and industrial activity.
 

Major sources of air pollution

 

Source Major pollutants:

 

• Industrial emissions        PM2.5, PM10, SO2, NOx, VOCs
• Vehicle emissions        PM2.5, NOx, CO, hydrocarbons
• Coal-based power plants        PM, SO2, NOx, mercury
• Construction activities        PM10, PM2.5
• Road dust            PM10, PM2.5
• Agricultural residue burning    PM2.5, CO, organic compounds
• Waste burning            PM2.5, PM10, toxic gases
• Domestic solid-fuel cooking    PM2.5, CO, black carbon
• Firecrackers            PM2.5, PM10, SO2, NOx and metal particles