Bronte Wells
New Delhi has been dubbed the world's most polluted city, with its air quality index (AQI) reaching 1,700 in some areas. The city's poor air quality has been attributed to various factors, including vehicular emissions, industrial activities, and agricultural practices such as stubble burning in neighbouring states. In 2016, Delhi experienced the Great Smog, with particulate matter levels far exceeding safe limits. While the government has implemented measures to improve air quality, such as banning firecrackers and shutting down polluting power plants, the problem persists, and the health impacts on residents are significant. This raises concerns about the impact of pollution on the city's residents and the effectiveness of current measures in place.
| Characteristics | Values |
|---|---|
| Air Quality Index (AQI) in June 2025 | 161 |
| Worst AQI level in the last 24 hours | 132 |
| Best AQI level in the last 24 hours | 94 |
| AQI level on 18 November 2024 | 491 |
| AQI level in November 2017 | 999 |
| AQI level in some parts of the city in 2024 | 1,700 |
| Percentage of pollution caused by stubble burning | 30-50% |
| Percentage of PM2.5 and NOx emissions from vehicles | 20% and 36% |
| Percentage of SO2 emissions from industrial sources | 90% |
| Percentage of PM2.5 and PM10 pollution from construction and road dust | 38% and 56% |
| Percentage of pollution caused by crop burning in winter | 45% |
| Number of cities in India with polluted air | More than 80% |
| Number of deaths due to polluted air in India in 2019 | 1,670,000 |
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What You'll Learn
Vehicular emissions and industrial activities
The number of vehicles registered in New Delhi has crossed six million, and the average speed of vehicles on major roads is just 20-30 km/hr, leading to poor vehicle mileage and increased emissions. The commercial four-wheeler segment, including app-based cab aggregators, was identified as a major polluting source in 2018. The impact of vehicular emissions is felt both indoors and outdoors, with studies showing increased mortality and morbidity rates associated with increased air pollution.
Industrial activities also play a significant role in New Delhi's air pollution. Point sources, such as power plants, contribute substantially to NOx and SO2 emissions, with 52% and 90% of these pollutants, respectively, originating from industrial activities. Additionally, biomass burning, including crop residue and cow dung combustion, contributes to the poor air quality.
To combat vehicular emissions, the Delhi Government decided that fuel stations would stop providing fuel to vehicles older than 15 years from April 2025. The Faster Adoption and Manufacturing of Electric Vehicles in India scheme aims for all vehicles to be battery-electric and hybrid by 2030, with combustion-engined vehicles upgraded to BS6 emission standards. The promotion of public transport, carpooling, and ride-sharing is also encouraged to reduce vehicular emissions.
To address industrial pollution, the highly polluting Badarpur power plant was shut down in October 2018. Additionally, the Punjab Government has implemented initiatives to reduce stubble burning, such as purchasing alternative crops at MSP and encouraging farmers to adopt less water-consuming options.
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Stubble burning in neighbouring states
Delhi is often ranked as one of the most polluted cities in the world. The city's air quality is a recurring concern, especially during the winter months when smog blankets the capital. While stubble burning in neighbouring states has been a major focus of the debate surrounding Delhi's air quality, the reality is that the problem is far more complex.
The impact of stubble burning on Delhi's air quality is complex and varies depending on the season and weather conditions. Studies suggest that the contribution of stubble burning to air pollution in Delhi is highest during the turbulent hours of late morning to afternoon. In the months of October and November 2021, stubble burning was estimated to contribute a maximum of 30-35% of the city's air pollution. However, in 2024, during the same period, stubble burning accounted for only 0.92% of PM2.5 levels in Delhi, indicating a decline in its impact.
In addition to stubble burning, local sources within Delhi also play a significant role in the city's air pollution. Vehicular emissions, industrial activities, construction dust, and the open burning of waste contribute heavily to the city's high PM2.5 concentrations. Over half of Delhi's PM2.5 pollution comes from vehicles, with vehicular emissions contributing about 67% of total air pollution. Other local sources include wood-burning fires, cow dung combustion, exhaust from diesel generators, and dust from construction sites.
To effectively tackle Delhi's air pollution crisis, a multi-pronged approach addressing both regional and local contributors is necessary. While stubble burning in neighbouring states has received significant attention, it is essential to recognize that local sources within Delhi also play a significant role. Therefore, solutions must target both regional contributors, such as stubble burning, and local emission sources, including vehicular emissions and industrial activities.
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Poor environmental protection laws
While India has a comprehensive framework of environmental laws, the country continues to face significant challenges in enforcing these laws and reducing pollution.
Delhi, in particular, has been notorious for its high levels of air pollution, with the air quality index (AQI) often exceeding safe levels. In 2024, Delhi recorded its worst air quality of the season, with an AQI reading of 491, classified as "severe plus." This level indicates hazardous conditions that can have significant health impacts, such as respiratory issues, hypertension, chronic headaches, eye irritation, sore throat, and skin irritation.
Various factors contribute to Delhi's poor air quality, including vehicular emissions, industrial activities, wood-burning fires, agricultural fires, and construction site dust. Despite efforts to reduce pollution, such as the ban on firecracker sales during Diwali and the closure of the Badarpur power plant, the city's air quality remains a concern.
The Indian government has implemented several environmental laws and initiatives to address these issues. For example, the Environment Protection Act, 1986, serves as an umbrella legislation under which various rules and notifications have been framed. The Wildlife Protection Act, 1972, aims to protect wildlife and their habitats, while the Water (Prevention and Control of Pollution) Act, 1974, addresses water pollution. Additionally, the government has promoted the adoption of electric vehicles, established air pollution control teams, and considered initiatives like the proposed 1,600 km long green ecological corridor.
However, the effectiveness of these laws and initiatives has been questioned. Critics argue that enforcement of environmental laws in India is often lacking, with pollution control measures needing to be strengthened and implemented on a larger scale. For instance, while the government has taken steps to reduce vehicular emissions, the number of vehicles on the road continues to increase, and public investment in alternative modes of transportation remains low.
Furthermore, community participation is crucial in reducing pollution, and educational initiatives to raise awareness about environmental protection laws and sustainable practices can empower individuals to make informed choices and contribute to collective efforts.
In summary, while India has a comprehensive framework of environmental laws, the effectiveness of these laws is hindered by enforcement challenges and the complex interplay of various factors contributing to pollution. Strengthening existing measures, promoting sustainable alternatives, and fostering community engagement are essential steps toward improving Delhi's air quality and ensuring the effective implementation of environmental protection laws.
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Lack of public infrastructure
Delhi, the capital of India, has been found to be the most polluted out of 7,000 world cities in an August 2022 survey by the US-based Health Effects Institute. The city's poor air quality has irreversibly damaged the lungs of 2.2 million children. Vehicular emissions, industrial activities, and stubble burning are the major contributors to Delhi's air pollution.
One of the root causes of Delhi's air pollution is the lack of public infrastructure. The city has a high volume of vehicle numbers, with approximately 1.69 lakh freight vehicles entering Delhi daily. The truck population is expected to rise significantly at the national level, from 4 million in 2022 to nearly 17 million by 2050. This increase in vehicles will further deteriorate air quality in Delhi, as vehicular emissions alone contribute about 72% of the total air pollution load in the city.
The lack of public infrastructure also includes inadequate pedestrian and cycling infrastructure. The maintenance of footpaths and cycling lanes requires significant improvement, and developing these infrastructures can improve economic opportunities, promote safety, and encourage a healthier lifestyle for the city. Additionally, disincentivizing the purchase and use of personal vehicles through congestion taxes, for example, can help reduce the number of vehicles on the road and improve air quality.
The drainage system in Delhi is also inadequate, with multiple agencies managing the system, leading to clogged drains and exacerbated waterlogging. This issue accelerates the deterioration of road surfaces, creating safety risks and increasing maintenance costs. Furthermore, the city's drainage system is designed to handle a limited amount of rain, which further contributes to the problem.
The Government of the National Capital Territory of Delhi has taken steps to reduce air pollution, such as promoting the use of public transport and metro rail. However, more needs to be done, and community participation is crucial to effectively reducing pollution levels in the city.
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Health impacts of air pollution
New Delhi, the capital of India, has been recognised as the most polluted capital city globally. As the second-largest city in the world, with a fast-growing economy and rapid urbanisation, New Delhi's severe air quality problem poses a significant threat to the health of its approximately 33 million citizens.
The air pollution in New Delhi is primarily caused by fine particulate matter (PM1), which is estimated to cause around 10,000 premature deaths annually. This figure is likely underestimated due to the inherent sampling bias associated with particle hygroscopic growth, which becomes more significant during humid conditions, a frequent occurrence in New Delhi. The true level of PM1 pollution could be even higher than currently measured.
The sources of air pollution in New Delhi are diverse and include vehicular emissions, industrial activities, burning of local organic waste, agricultural practices, and power plants. These sources contribute to both indoor and outdoor air pollution, with vehicular emissions being the most significant contributor, accounting for about 72% of the total air pollution load.
The health impacts of air pollution in New Delhi are extensive and range from respiratory issues to non-respiratory effects. The city has the highest death rate from chronic respiratory diseases and asthma worldwide, according to the World Health Organization. Additionally, the poor air quality has irreversibly damaged the lungs of 2.2 million children in the city. The air pollution also leads to other health issues such as hypertension, chronic headaches, eye irritation, sore throat, and skin irritation. Studies have shown that all-natural-cause mortality and morbidity increase with increased air pollution levels in New Delhi.
To address the critical health impacts of air pollution, the Government of National Capital Territory of Delhi has implemented various measures over the years. These include encouraging the use of public transport, promoting ride-sharing and carpooling, enhancing parking fees, shutting down highly polluting power plants, and encouraging the use of environmentally friendly fuels. However, more needs to be done, and community participation is crucial to effectively reducing pollution levels and mitigating the health risks associated with air pollution in New Delhi.
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Frequently asked questions
It is difficult to provide an exact figure for the tons of pollution in New Delhi per year, but it is estimated that about 3000 metric tons of air pollutants are emitted every day.
The main causes of pollution in New Delhi are vehicular emissions, industrial activities, and crop stubble burning.
Air pollution has been linked to various health issues in New Delhi, including respiratory problems, hypertension, chronic headaches, eye irritation, sore throat, and skin irritation.
Efforts to reduce pollution in New Delhi include promoting the use of public transport, enhancing parking fees, closing power plants and brick kilns, encouraging the use of green electricity, and implementing air pollution control measures.
As of June 17, 2025, the real-time AQI level in New Delhi was 133, which is considered "Poor."
