Bronte Wells
Air pollution is a pressing global issue, causing millions of deaths annually. The World Health Organization (WHO) reports that air pollution kills nearly 9 million people worldwide each year, with 99% of the world's population living in areas with air quality that exceeds WHO guideline limits. Burning fossil fuels, such as coal, oil, and natural gas, for electricity and transportation, is a significant contributor to air pollution. The top 20 most polluted cities in the world are primarily located in Asia, with 13 in India, four in Pakistan, and one in China. N'Djamena, the capital of Chad in Central Africa, is the only city outside of Asia on the list. This issue is not limited to a single region, as evidenced by California's cities having the worst pollution in North America. Real-time air pollution maps are available for over 100 countries, providing valuable data for addressing this critical problem.
| Characteristics | Values |
|---|---|
| Most polluted cities in the world | Kashgar (China), New Delhi (India), Ghaziabad (India) |
| India's ranking | 12 of the world's 15 most polluted cities are in India, and 63 of the 100 most polluted places |
| Air pollution sources | Vehicular traffic, diesel generators, burning of fossil fuels, industry, burning of waste, crop burning |
| Effects of air pollution | Asthma attacks, harm to lung development in children, premature births, late-term pregnancy complications, respiratory illnesses, acid rain, reduced crop yields, reproductive failure and diseases in wildlife animals |
| Air pollution deaths | Nearly 9 million people worldwide every year |
| WHO air quality standards | 9 out of 10 people inhale air that exceeds WHO air quality standards |
| Most chemically polluted city in the world | Dzerzhinsk, Russia |
| Most polluted city in China | Linfen |
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What You'll Learn
Most polluted cities: New Delhi, Kashgar, Ghaziabad
Air pollution is a significant health burden and the biggest health risk in India, reducing life expectancy by an estimated 5.2 years. According to the 2024 World Air Quality Report, 13 of the 20 most polluted cities in the world are in India. These include New Delhi, Ghaziabad, and Faridabad. New Delhi, in particular, has consistently maintained high pollution levels, with an annual average of 91.6 μg/m³ in 2024, which is nearly unchanged from 92.7 μg/m³ in 2023.
Ghaziabad, located in the northern region of India, was the most polluted city among 60 north Indian cities last winter, with a particulate matter 2.5 (PM2.5) average of 178 micrograms per cubic meter (g/m3). This was followed by Delhi, which had a winter average of 170 ug/m3. The high pollution levels in these cities are largely attributed to the spike in particulate pollution during the winter months, which stays elevated for extended periods.
New Delhi and Ghaziabad are not alone in their struggle against air pollution. Other cities in India, such as Faridabad, Manesar, Baghpat, Noida, and Gurugram, also face significant pollution challenges. These cities, part of the National Capital Region (NCR), consistently rank among the most polluted areas in the country. The NCR region, including New Delhi, has seen a marginal increase in average peak 24-hour pollution levels, despite overall improvements in recent years.
Outside of India, Kashgar in China is recognized as one of the most polluted cities globally. Despite this distinction, China ranks 12th among the world's top 20 most polluted countries. The varying rankings within a country underscore the localized nature of air pollution and the diverse range of factors contributing to it.
The health impacts of air pollution are severe and far-reaching. Particles in the air can be smaller than 1/30th the diameter of a human hair, penetrating the body's natural defenses. Vulnerable groups, including children, older adults, and people with lung diseases, are at heightened risk from air pollution. It can trigger asthma attacks, impair lung development in children, and even lead to premature deaths. As a result, it is crucial to monitor air quality forecasts and take protective measures, such as wearing proper masks during periods of high pollution.
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Pollution from fossil fuels and vehicles
The burning of fossil fuels and vehicle emissions are major contributors to air pollution, which has been declared the biggest health risk worldwide. According to the World Health Organization (WHO), 9 out of 10 people breathe air that exceeds healthy standards, causing over 6 million premature deaths.
Fossil fuels, such as coal, oil, and natural gas, are formed from the decomposition of carbon-based organisms that lived millions of years ago. When these fuels are burned for energy, they release harmful emissions, including nitrogen oxides, which contribute to smog and acid rain. The transportation sector is a significant source of nitrogen oxide emissions, and vehicles also produce particulate matter that can be inhaled, leading to serious health issues.
In the United States, the burning of fossil fuels associated with transportation and industry is the primary source of nitrogen oxide emissions. Climate change, driven in large part by fossil fuel use, exacerbates the conditions for ozone pollution and increases the risk of wildfires, which further contribute to dangerous particle pollution. People who live or work near busy highways are at greater risk of health issues due to traffic pollution.
To combat air pollution from vehicles, individuals can take steps such as consolidating driving trips, carpooling, or using public transportation. Additionally, reducing energy consumption can help minimize airborne nutrient pollution caused by fossil fuel use in power generation. This can be achieved by turning off electrical equipment when not in use, using energy-efficient products, and limiting air conditioning.
It is important to transition to a clean energy future and embrace renewable energy sources. Businesses can play a crucial role by understanding and managing their greenhouse gas emissions, setting targets for emission reduction, and advocating for policies that support a sustainable environment.
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Indoor air pollution
The health effects of indoor air pollution are significant. Poor indoor air quality can cause or contribute to infections, lung cancer, and chronic lung diseases such as asthma. It can trigger asthma attacks, harm lung development in children, and increase the risk of stroke, ischaemic heart disease, and chronic obstructive pulmonary disease (COPD). The cumulative effects of indoor and outdoor air pollution have been linked to approximately 6.7 million premature deaths annually.
To mitigate the risks associated with indoor air pollution, individuals can take steps to improve indoor air quality. This includes ensuring proper ventilation, following guidelines for the selection of clean fuels and technologies, and being mindful of potential sources of indoor air pollution, such as construction materials and fuel-burning appliances. Additionally, organizations like the WHO and the U.S. Environmental Protection Agency (EPA) provide resources and guidelines to help address indoor air pollution and improve air quality.
In conclusion, indoor air pollution is a critical issue that warrants attention and action. By understanding the sources and health risks associated with indoor air pollution, individuals, communities, and organizations can work together to implement effective solutions, ultimately improving air quality and protecting public health.
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Health risks: respiratory issues, premature births, cancer
Air pollution is a major health risk, with immediate effects hard to ignore. According to the World Health Organization (WHO), 9 out of 10 people breathe air that exceeds the WHO air quality standards. This has resulted in over 6 million premature deaths, making it the second biggest killer worldwide after tobacco smoke.
One of the most vulnerable groups to the effects of air pollution are children. A study has linked air pollution to almost 6 million premature births and 3 million underweight infants in a year. Indoor air pollution, often from cooking stoves, is responsible for two-thirds of these cases, with the situation being worse in low- to middle-income countries. Burning coal, dung, and wood in inefficient stoves and open hearths are the leading producers of health-damaging pollutants, such as airborne particulates. These pollutants can also harm lung development in children, increasing the risk of respiratory issues later in life.
Air pollution can also trigger asthma attacks, with people who have asthma or COPD being particularly vulnerable. Those who work or exercise outside are at an increased risk from the effects of air pollution, as are people of colour and those with lower incomes. Climate change further enhances the conditions for ozone pollution and makes it harder to clean up communities with high ozone levels.
Long-term exposure to air pollution has been linked to an increased risk of lung cancer, with outdoor air pollution being a major contributor to the global burden of disease. While the link between air pollution and specific histologic types of lung cancer is still being investigated, some studies have suggested stronger findings with adenocarcinoma. In addition to lung cancer, other types of cancers in adults and childhood cancers have also been associated with air pollution.
Some interventions to reduce exposure to air pollution include the use of personal respirators, household filtration systems, and avoiding outdoor exercise or work when unhealthy air quality is expected.
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Industrial pollution: Dzerzhinsk, Norilsk, La Oroya
Dzerzhinsk, Russia, has been named the most chemically polluted city in the world by the Guinness Book of World Records. The city's pollution stems from toxic chemical production, with a quarter of its 300,000 residents employed in factories producing these chemicals. The local groundwater and canal water levels have risen due to the closure of some industries, threatening to release massive amounts of arsenic, mercury, lead, and dioxins into the Oka river basin, the drinking water source for Nizhny Novgorod and adjoining villages. Local drinking water supplies in Nizhny Novgorod City, Gavrilovka, and Pyra are already heavily contaminated. Dzerzhinsk's death rate is alarmingly high, with the rate exceeding the birth rate by 260% in 2003, and the annual death rate of 17 per 1,000 higher than Russia's national average of 14.
Norilsk, Russia, is another city that has often been cited as one of the most polluted places globally. The economy of Norilsk is dominated by mineral extraction and processing, with the city facing issues of heavy industrial pollution. In 2016, the world was shocked by images of the Daldykan River in Norilsk turning blood red due to a slurry spillage over a filtration dam. While Norilsk Nickel initially denied responsibility, they eventually admitted fault after significant media exposure. The company claimed that the incident posed no danger to humans or river flora and fauna and committed to improving safety measures.
La Oroya, a small town in the Peruvian Andes, has been exposed to extreme levels of toxic pollution for over 100 years due to an industrial smelter. This pollution has led to dangerously high levels of lead and other heavy metals in the blood of nearly all the town's children. The Inter-American Court of Human Rights made a historic ruling in March, condemning Peru for failing to control toxic industrial pollution and ordering the country to halt further harmful pollution, clean up toxic metals in the soil and water, and provide specialized healthcare for La Oroya's residents. This ruling sets a significant precedent for the right to a healthy environment and state oversight of corporate activities across the Americas.
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Frequently asked questions
According to a report by IQAir, a Swiss company that tracks global air quality, the top 20 most polluted cities in the world are mostly in Asia. 13 of these cities are in India, where economic growth is largely fired by coal. The remaining cities are in Pakistan, China, Kazakhstan, and Chad.
The biggest sources of air pollution are the burning of fossil fuels, such as coal, oil, and natural gas, in power plants and vehicles. The burning process releases air pollutants, emissions, and chemicals into the atmosphere.
Air pollution from coal, oil, and gas-burning sources kills nearly 9 million people worldwide annually, according to the World Health Organization (WHO). It causes increased mortality from stroke, heart disease, lung cancer, and acute respiratory infections. Air pollution can also impact the environment, causing acid rain, reduced crop yields, and reproductive failure in wildlife animals.
