Greta Jimenez
Delhi, the capital of India, has been named the most polluted city in the world by various sources. The air pollution in Delhi is estimated to kill about 2 million people every year and has irreversibly damaged the lungs of 2.2 million children. The sources of pollution are varied, with a 2016 study showing that 38% of PM2.5 pollution came from road dust, 20% from vehicles, 12% from domestic fuel burning, and 11% from industrial sources. Other factors include crop stubble burning, fireworks during festivals, and rapid urbanisation. The Indian government has attempted to tackle the issue with schemes such as the odd-even traffic rule, but the problem persists and is a public health crisis.
| Characteristics | Values |
|---|---|
| Air pollution in Delhi | Most harmful of any major city in the world |
| Annual deaths in India due to air pollution | 2 million |
| Cause of death in India | Fifth largest |
| Deaths in Delhi due to poor air quality | 2.2 million children with irreversibly damaged lungs |
| Delhi's pollution ranking | Delhi has regularly been the world's most polluted city |
| Main sources of PM2.5 pollution | Road dust, vehicles, domestic fuel burning, industrial point sources |
| Main sources of PM10 pollution | Road dust, concrete batching, industrial point sources, vehicles |
| Main sources of NOx emissions | Industrial point sources, vehicles |
| Main sources of SO2 emissions | Industrial point sources |
| Main sources of CO emissions | Vehicles |
| Impact of court-ordered restrictions on bus services | Increased purchase of private cars and construction of roads |
| Impact of Diwali firecrackers | Release of harmful chemicals and airborne particles |
| Impact of crop stubble burning | Release of smoke and harmful particles, worsening pollution levels |
| Impact of construction | Increased dust and pollution, affecting air quality and health |
| Overpopulation in Delhi | Over 20 million people, leading to more cars, waste, and energy consumption |
| Lack of public transport | Dependence on private vehicles, causing traffic jams and increased pollution |
| Solutions | Odd-even traffic scheme, use of masks, air purifiers, and indoor plants |
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What You'll Learn
Crop stubble burning
Delhi, the capital of India, has been dubbed the most polluted city in the world. The city's poor air quality has been linked to the irreversible lung damage of 2.2 million children. A complex interplay of factors contributes to Delhi's pollution, and one significant factor is crop stubble burning.
The impact of crop stubble burning on Delhi's air quality is significant. The smoke from these fires, containing harmful pollutants, is carried by the wind to Delhi and the surrounding National Capital Region (NCR). The timing of these burning activities, often in the post-monsoon and winter seasons, coincides with weather patterns that trap the polluted air over the city. This leads to a dangerous accumulation of pollutants and a deterioration in air quality.
The Indian government has attempted to address this issue by implementing policies to reduce stubble burning. One such policy, introduced in 2008, encouraged farmers to take advantage of monsoon rains for crop cultivation instead of groundwater irrigation. While this policy aimed to reduce groundwater depletion, it had the unintended consequence of delaying the harvesting of Kharif crops and, subsequently, the burning of stubble. This delay further exacerbated the air pollution crisis in northern India, including Delhi.
To mitigate the impact of crop stubble burning on air pollution, alternative methods for crop residue management need to be encouraged. For example, providing farmers with access to affordable and efficient machinery for residue removal or promoting the adoption of sustainable practices such as converting crop residue into biofuel or compost. Additionally, increasing public awareness about the health risks associated with air pollution and the impact of stubble burning can help foster a collective sense of responsibility and encourage the exploration of alternative methods.
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Industrial point sources
Delhi's industrial landscape is diverse, encompassing various sectors such as textiles, metal, paper products, rubber, plastics, petroleum, and chemicals. The use of fossil fuels in industrial boilers and furnaces, as well as vehicle emissions associated with industrial activities, further exacerbates air pollution.
One notable example of an industrial source of pollution in Delhi was the Badarpur Thermal Power Station, a coal-fired power plant. Despite contributing less than 8% of the city's electricity, it was responsible for 80-90% of particulate matter pollution from the electric power sector. The plant was permanently shut down in October 2018 due to its detrimental environmental impact.
In addition to power plants, other industrial sources of pollution in Delhi include factories, chemical industries, and construction sites. Dust from construction activities contributes significantly to air pollution, along with emissions from vehicles used for industrial purposes, such as loading and unloading.
While industrialization has driven economic development, it has also led to environmental and health challenges. The high concentrations of pollutants in industrial areas of Delhi have been linked to respiratory diseases among industrial workers and their families, highlighting the urgent need to address industrial pollution. Reducing emissions from industrial sources and transitioning to cleaner technologies are crucial steps towards improving Delhi's air quality and protecting the health of its residents.
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Road dust
Delhi's roads are notoriously poorly constructed and maintained, which exacerbates the problem of road dust. Vehicle emissions also play a role in generating road dust as vehicles grind and wear down road surfaces, releasing particles into the air. In addition, wind and vehicle turbulence can resuspend settled particles, leading to higher suspension rates.
The issue of road dust is further amplified by ongoing construction activities, potholes, unregulated waste dumping, and insufficient street cleaning. The city's efforts to combat road dust, such as the National Clean Air Programme (NCAP), have not yielded significant results, with Delhi utilising just 32% of the funds allocated under the NCAP as of November 2024.
To address the problem of road dust, the Delhi Pollution Control Committee has implemented various measures, including mandatory registration on the Dust Portal for construction and demolition projects, anti-dust campaigns, and the implementation of a Winter Action Plan. The committee has also issued directions under the Air (Prevention and Control of Pollution) Act to take restrictive actions under the Graded Response Action Plan when air quality deteriorates.
The impact of road dust on human health is significant, with commuters across most modes of travel in Delhi being exposed to 10 to 40% higher levels of PM2.5 compared to ambient concentrations. The poor air quality caused by road dust has irreversible lung damage in 2.2 million children in Delhi and has been linked to various respiratory and non-respiratory health issues.
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Overpopulation
Delhi, the capital of India, has been labelled the most polluted city in the world. The air pollution in Delhi is estimated to kill about 2 million people every year. Overpopulation is a significant contributor to this issue.
Delhi's overpopulation problem is exacerbated by the influx of people from other parts of India. The city's population has been growing rapidly, putting immense pressure on the city's infrastructure and resources. This has led to overcrowding, with people living in close quarters and sharing limited resources such as water and electricity. The overcrowding has also led to an increase in traffic, with more vehicles on the road and more people relying on private transportation due to the inadequate public transport system.
The overpopulation in Delhi has resulted in a lack of proper waste management systems, with solid waste treatment facilities being insufficient to handle the amount of waste generated by the city's population. This has led to water pollution, damaging the Yamuna River, on whose banks Delhi was built. Additionally, the high population density has increased the demand for energy, leading to an increase in emissions from power plants, particularly the Badarpur Thermal Power Station, which was a major source of air pollution in the city.
The overpopulation in Delhi has also contributed to the city's poor air quality. The large number of vehicles, coupled with dust from construction and road works, has led to high levels of vehicular emissions and dust. The court-ordered restrictions on bus services in Delhi have further exacerbated the problem, as people have resorted to using private cars, increasing vehicle emissions. Additionally, the overpopulation has led to an increase in domestic fuel burning for cooking and heating, contributing to air pollution, especially during the winter months when slow winds and cool temperatures trap dust and pollutants close to the ground.
The impact of overpopulation on Delhi's pollution problem is evident, and the city has taken some measures to address it. The Delhi Forest Act, for example, stipulates that for every felled tree, ten saplings must be planted. However, the effectiveness of this policy has been disputed, and the city continues to struggle with the environmental consequences of its growing population.
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Fireworks during festivals
Delhi, the capital of India, has been deemed the most polluted city in the world on several occasions. In August 2022, a survey of 7,000 world cities found that Delhi's air pollution was the most harmful. The poor air quality in Delhi has irreversibly damaged the lungs of 2.2 million children.
One of the main contributors to Delhi's air pollution is the burning of firecrackers during the religious festival of Diwali. The festival, celebrated in India for the last 2500 years, initially involved lighting oil lamps, but fireworks were introduced around 1400 AD. The use of fireworks in densely populated urban areas like Delhi has been linked to severe air pollution and adverse health effects.
Several studies have confirmed the impact of Diwali firecrackers on Delhi's air quality. Research has shown that the concentration of PM2.5 particles, one of the most harmful pollutants, increases significantly during and after the festival. The burning of firecrackers releases toxic substances, including metals, that contribute to heavy air pollution. The Indian government has attempted to address this issue by banning the sale and use of fireworks during Diwali in several states, including Delhi. However, enforcement of these bans has been challenging.
The impact of Diwali fireworks on Delhi's air pollution is compounded by other factors. The festival coincides with the stubble burning season in the neighbouring states of Punjab and Haryana. Farmers burn the crop residue to clear their fields for the next planting season, and the smoke is carried to Delhi, exacerbating the smog and air pollution. Additionally, vehicle emissions and increased traffic during Diwali also contribute to the overall pollution levels.
To mitigate the effects of pollution during Diwali, the National Disaster Management Authority has issued guidelines such as avoiding outdoor activities, staying indoors, using air purifiers, and encouraging the use of public transportation or carpooling. While these measures can help reduce the impact on individuals, addressing the root causes of pollution during Diwali requires stricter enforcement of bans on firecrackers and stubble burning, as well as the promotion of alternative, eco-friendly ways to celebrate the festival.
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Frequently asked questions
Delhi's pollution comes from a variety of sources, including vehicle emissions, road dust, industrial sources, and domestic fuel burning.
Delhi has a high number of private vehicles on its roads, including cars, scooters, and auto-rickshaws, which are major contributors to the city's air pollution.
The large number of vehicles and the construction of new roads to accommodate them have increased road dust, which is another significant source of pollution in Delhi.
Industrial sources, particularly power plants, contribute significantly to Delhi's pollution, especially in the form of NOx and SO2 emissions.
Yes, crop stubble burning in surrounding states, fireworks during festivals, and the city's geographic location, which can trap cold air and prevent the dispersal of pollutants.
