This can be better understood by exploring the main causes of air-pollution in Delhi:
a. Industrial waste and effluent release into the air and water. (All year round)
b. Vehicular pollution: Passenger, light goods, heavy goods all government and private. (All year round)
c. Seasonal Agri crop waste burning (Especially around winter)
d. Burning of solid waste and landfills - ewaste, industrial waste, household waste, hazardous and bio-medical waste. (All year round)
e. Energy production and usage. (All year round)
f. Use of wood and waste wood incineration (All year round)
g. Devolved commercialized religious rituals, practices and festivals- bonfires, bursting fire crackers, heavy vehicle movement for processions and transport etc.
h. Animal husbandry and cattle rearing (All year round)
There may be many more reasons but these are the major ones for Delhi NCR's situation. Most of the resident population would say they are not party to the problem as many of them use public transport and do not directly contribute to any of the above, however indirectly they do through their consumption. Everything they use and own requires two things in processing, water and electricity and even the filtration and pumping of water requires electricity and both require burning of fuels to generate energy to convert into electricity. So even in small ways living a sustainable life can contribute when done by masses.
So why does it get worse in the winter in Delhi? The problem in part is the water vapor in the air. Naturally all year a certain amount of humidity exists in the air and air conditioning is used across the city and this results in drying of air indoors and increase in humidity outdoors resulting in heating and trapping of particulate matter in suspension in the air. Vehicular exhausts, factories etc, all increase ambient humidity in atmosphere. On a clear summer day the sun evaporates the vapor resulting in less suspended particulate whereas in the winter the soup bowl that is Delhi surrounded on three sides becomes a vapor trap and cooling resulting in formation of thick mist that blocks the sun out and prevents warming and results in increased particulates in the breathable air. This is why air pollution is worse in winter than in the rest of the year.
Effects of Air Pollution
i. Construction/demolition activity (All year round)
j. Open flame cooking using wood, waste wood or coal (All year round)
k. Heavy duty goods transport diesel vehicles
l. Inefficient PUC checks and traffic regulation
There may be many more reasons but these are the major ones for Delhi NCR's situation. Most of the resident population would say they are not party to the problem as many of them use public transport and do not directly contribute to any of the above, however indirectly they do through their consumption. Everything they use and own requires two things in processing, water and electricity and even the filtration and pumping of water requires electricity and both require burning of fuels to generate energy to convert into electricity. So even in small ways living a sustainable life can contribute when done by masses.
So why does it get worse in the winter in Delhi? The problem in part is the water vapor in the air. Naturally all year a certain amount of humidity exists in the air and air conditioning is used across the city and this results in drying of air indoors and increase in humidity outdoors resulting in heating and trapping of particulate matter in suspension in the air. Vehicular exhausts, factories etc, all increase ambient humidity in atmosphere. On a clear summer day the sun evaporates the vapor resulting in less suspended particulate whereas in the winter the soup bowl that is Delhi surrounded on three sides becomes a vapor trap and cooling resulting in formation of thick mist that blocks the sun out and prevents warming and results in increased particulates in the breathable air. This is why air pollution is worse in winter than in the rest of the year.
Effects of Air Pollution
- Air pollution causes irritation in the throat, nose, lungs and eyes. It causes breathing problems and aggravates existing health conditions such as emphysema and asthma.
- Contaminated air reduces the body’s defenses and decreases the body’s capacity to fight other infections in the respiratory system.
- Frequent exposure to polluted air increases the risk of cardiovascular disease. Breathing air that is filled with fine particulate matter can induce hardening of the arteries, triggering cardiac arrhythmia or even a heart attack.
- People who exercise outdoors are susceptible to the adverse effects of air pollution because it involves deeper and faster breathing.
- Acid rain contains hydrogen ions, which can damage trees, crops, harm marine animals and induce corrosion in metals.
- Smog causes harmful health effects in humans and animals. Studies have shown signs of black lung disease in dolphins of due to high concentrations of carbon particles in the air.
- People afflicted with heart disease, children and older people are more sensitive to air pollution.
- Joseph T. Varghese, Author & Managing Trustee, KEYS Trust
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(Statutory warning: This blog post by no means is an exhaustive list of what causes air pollution and how it affects health. This is a representation of views & factss that came forth from the author based on years of learning and experience and knowledge as we know expands and changes and grows with time and access to new information via research. Any images used are not owned by the author or KEYS Trust and belong to their original sources and are merely used for education & visual representation purpose.Any suggestions or improvements are welcomed and any flaws in the content in terms of correction, omission or additions may be kindly excused & communicated to the author by way of email to: keystrustindia@gmail.com)













