Greta Jimenez
Mumbai, India, is a highly populated city with a significant air pollution problem. The city's air quality index (AQI) often falls to poor levels, with the presence of harmful pollutants such as PM2.5, PM10, and nitrogen dioxide (NO2) exceeding the safe limits recommended by the World Health Organization (WHO). The main sources of pollution in Mumbai are urban activities such as traffic, construction, and industrial units in residential areas. The health effects of breathing polluted air are well-documented, and the financial burden associated with the increase in respiratory and other health issues is significant. While there are efforts to improve air quality in Mumbai, the implementation of effective pollution mitigation plans remains a challenge.
| Characteristics | Values |
|---|---|
| Air Quality Index (AQI) | 72 (Moderate) |
| AQI in the last 24 hours | Best: 63 (Moderate); Worst: 84 (Moderate) |
| Particulate matter of PM10 | 145.7 µg/m³ |
| Nitrogen dioxide (NO2) | 80.8 µg/m³ |
| PM2.5 concentration | 3.8 times the World Health Organization (WHO) annual guideline value |
| Particulate matter of PM2.5 | 85.9 µg/m³ |
| Particulate matter of PM10 in 2018 | 162 µg/m³ |
| Nitrogen dioxide (NO2) in September 2019 | 50 µg/m³ to 69 µg/m³ |
| Pollution season | November to February (winter months) |
| Pollution sources | Traffic, construction, road and construction dust, industrial units, illegal waste burning, poor transportation planning |
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What You'll Learn
Air pollution sources: automobiles, industries, construction, garbage burning
Mumbai is one of the most polluted cities globally, with air pollution posing a significant threat to its residents. The primary sources of air pollution in the city include automobiles, industries, construction, and garbage burning, each contributing to the city's poor air quality in different ways.
Automobiles are a major contributor to air pollution in Mumbai. The city has witnessed a rapid increase in the number of registered vehicles, with the population doubling from 1.5 million to 3 million within a decade. This has led to a high vehicular density, with 1014 vehicles per kilometre and 510 cars per kilometre, the highest in India. Vehicular emissions, including nitrogen dioxide (NO2), have severe adverse effects on human health and the environment. Studies estimate that vehicles in Mumbai release 8562 mg/km2 of CO2, significantly deteriorating the city's air quality.
Industrial activities also play a significant role in Mumbai's air pollution. Industrial waste, emissions, and the presence of industrial units in residential areas contribute to the city's poor air quality. Power generation and power plants are among the top sources of particulate matter, adding 20% to the PM levels. The impact of industrial pollution is evident in specific areas of the city, such as Deonar, Govandi, Mankhurd, and Trombay, which consistently record high pollution levels.
Construction activities are another critical factor in Mumbai's air pollution crisis. Airborne construction materials, such as dust, can cause severe health issues, including silicosis. The booming real estate development has led to a surge in construction projects, exacerbating the city's air quality issues. The local municipality has introduced initiatives to address construction site pollution, such as sprinklers and proper disposal of construction materials, but more needs to be done to mitigate the impact.
Garbage burning is a rampant problem in Mumbai, with illegal waste burning contributing significantly to air pollution. Dumping grounds and the indiscriminate incineration of garbage and crop residue release toxic particulate matter into the air. While community-level drives against open-waste burning have been conducted, developing comprehensive ward-level action plans and improving waste management education are crucial to addressing this issue effectively.
Overall, Mumbai's air pollution crisis demands urgent action and a collective effort from authorities, industries, and individuals. Reducing emissions, improving waste management practices, and transitioning to greener fuels are essential steps towards improving the city's air quality and protecting the health of its residents.
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Air quality index (AQI) and health implications
Mumbai's air pollution is typically at its worst from November to February, during the winter months. The air quality index (AQI) in the city is largely impacted by the concentration of toxic particulate matter PM2.5 or PM10, whichever is higher. In 2018, Greenpeace India ranked Mumbai as the 37th most polluted city in the country, with levels of air pollution exceeding safety standards for more than 52 days.
The main sources of pollution in Mumbai are automobiles, industries, construction activities, and garbage burning. In particular, particulate matter of PM10 and nitrogen dioxide (NO2) have been identified as the most critical pollutants with the greatest impact on health. The health implications of exposure to poor air quality include coughs, breathlessness, wheezing, colds, chronic obstructive pulmonary disease (COPD), and allergic rhinitis. Nitrogen dioxide levels in Mumbai have been recorded well over the WHO's safe limit of 40 µg/m³, with figures rising to between 50 µg/m³ and 69 µg/m³ in September 2019.
The Maharashtra state government has implemented pollution mitigation plans to tackle the issue of air pollution. However, these plans have been criticised for not adequately addressing major sources of pollution, such as industry and automobiles. To address this, individuals are being encouraged to make personal changes, such as carpooling or using public transportation. Additionally, there are plans to increase the number of monitoring stations to provide more accurate data and help combat the issue.
On June 23, 2025, Mumbai's AQI level was recorded at 72, which is considered moderate. While the levels are currently acceptable, some pollutants may be a concern for sensitive individuals. The AQI levels in the city have been fluctuating, with the highest reading of 84 and the lowest of 63 in the last 24 hours. As of June 25, 2025, the AQI level in Mumbai was recorded at 80, still within the moderate range.
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Government initiatives to tackle pollution
Mumbai, India's financial capital, has been witnessing deteriorating air quality in recent years. The city's air quality index (AQI) has frequently been recorded in the "poor" to "very poor" range, with high levels of particulate matter (PM2.5 and PM10) and nitrogen dioxide (NO2) pollution. The main sources of this pollution are road and construction dust, traffic congestion, industrial activities, power generation, and waste burning.
To tackle this issue, the Government of India, along with local authorities, has undertaken several initiatives to reduce air pollution in Mumbai and across the country. Here are some key government initiatives:
- National Clean Air Programme (NCAP): The Indian government launched the NCAP, a nationwide strategy to reduce air pollution and improve air quality across the country. While the NCAP provides a framework, its implementation is voluntary for local governments. The Maharashtra state government's pollution mitigation plans, prepared by the Maharashtra Pollution Control Board (MPCB) and accepted by the Central Pollution Control Board (CPCB), have been criticised for not adequately addressing pollution from industries and automobiles.
- Clean Air Mumbai: The Brihanmumbai Municipal Corporation (BMC) has introduced a seven-step strategy under the 'Clean Air Mumbai' initiative. This includes hotspot monitoring, creating a Clean Air Coordination Committee, appointing consultants to work with pollution-emitting companies, and installing air purifiers in crowded areas.
- Communication and Awareness Campaigns: BMC is partnering with mainstream media, schools, colleges, and NGOs to raise awareness about air pollution and promote an environmentally friendly lifestyle. They are also training sanitation workers in better road dust cleaning practices and issuing public health advisories during periods of poor air quality.
- World Bank Support: The World Bank is aiding India in Air Quality Management through a phased strategy under its Country Partnership Framework. This includes enhancing knowledge, building capacity, involving stakeholders, transferring expertise, facilitating policy adjustments, and mobilizing finance for more effective government programs. The World Bank is also supporting the development of India's first State Air Quality Action Plans and the Regional Airshed Action Plan for the Indo-Gangetic Plains (IGP), where pollution and population density are most concerning.
- India Lighthouse Initiative: This initiative brings together experts from India and abroad to develop India-specific practices and tools to better understand, manage, and control air pollution.
While these initiatives demonstrate a commitment to tackling air pollution in Mumbai and India, their effectiveness and impact on air quality will depend on sustained implementation, coordination, and the involvement of various stakeholders, including individuals, businesses, and government entities.
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Real-time air pollution monitoring and solutions
Mumbai's air pollution is a growing problem, largely due to its industrial expanse, strong reliance on fossil fuels, and dense population. The city's financial power and accessible resources provide a strong impetus for the Maharashtra government to take action and reduce emissions. Air pollution causes severe health issues and even deaths, with a significant impact on the economy.
Real-time air pollution monitoring is essential to track the air quality and take necessary actions. Various tools and technologies are available to monitor air pollution in Mumbai. One example is the GAIA air quality monitor, which provides real-time data by connecting to a WiFi access point and a USB-compatible power supply. The National Environmental Engineering Institute (NEERI) also plays a crucial role in examining the sources of air pollution and their contributions to the overall pollution load.
To address the air pollution issue, Mumbai has taken several steps. The Maharashtra Electric Vehicle Policy 2025 aims to electrify public transportation, with ₹992 crore allocated for this initiative. The city has also implemented speed limits and used anti-smog guns to reduce dust turbulence caused by vehicles. Additionally, the Maharashtra Pollution Control Board (MPCB) has developed plans to tackle pollution, although they have been criticised for not addressing industrial and automobile sources.
Mumbai's city-level action plan includes creating green buffers along traffic corridors and blacktopping metalled roads. The Construction and Demolition Waste Management Rules, 2016, aim to mitigate the impact of construction activities on air quality. The Maharashtra government has also allocated funds towards dust mitigation, recognising the need for a concerted effort to address the growing contribution of road dust to pollution.
To further improve air quality, a shift towards cleaner fuels and renewable energy sources is necessary. This includes phasing out older power plants and vehicles, increasing the use of non-motorised transport, and adopting electric vehicles. Public awareness about the effects of breathing polluted air is vital, as it empowers individuals to make informed choices, such as carpooling or using public transportation. Additionally, waste management practices should be improved, with a focus on preventing open-waste burning and implementing environmentally beneficial garbage segregation, transportation, and recycling methods.
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Seasonal variations in air quality
Mumbai's air pollution is typically at its worst from November to February, during the winter months. There is considerably less rainfall during these months, which acts as a natural cleanser for the air. In November 2024, the Bandra Kurla Complex was the most polluted area within the city, with a US AQI figure of 305, which is classed as very poor. The PM2.5 reading came in at 85.9 µg/m³, while PM10 recorded a concentration of 145.7 µg/m³, O3 measured 8.7 µg/m³ and NO2 recorded a concentration of 80.8 µg/m³.
The poor air quality during the winter months can be attributed to various factors, including the illegal burning of waste products, a poor planning system for waste transportation, and industrial units in residential areas. In addition, the increase in toxic PM2.5 caused by automobiles, industries, construction activities, and garbage burning contributes to the overall toxicity of the air.
On the other hand, the summer months tend to see an improvement in air quality. For example, in June 2025, Mumbai's overall air quality index ranged from 63 to 84, which is considered moderate. The air quality during this period is generally acceptable for most individuals, although sensitive groups may still experience minor to moderate symptoms from long-term exposure. The moderate levels in June were attributed to recent rainfall, which helps to cleanse the air of pollutants.
Despite the seasonal variations, Mumbai's air pollution levels remain a concern throughout the year. The Maharashtra state government's pollution mitigation plans have been criticised for not adequately addressing the major sources of pollution, including industry and automobiles. As a coastal city, Mumbai's high levels of pollution are particularly notable, as its location should naturally lend itself to better air quality.
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Frequently asked questions
Exposure to poor air quality can cause health issues such as coughs, breathlessness, wheezing, colds, chronic obstructive pulmonary disease (COPD), and allergic rhinitis.
The main sources of pollution in Mumbai are traffic, construction, industrial units in residential areas, and the illegal burning of waste products.
Mumbai's AQI varies. In 2024, it dipped to poor levels, surpassing Delhi's severe pollution. In June 2025, the AQI level was moderate.
The Maharashtra state government has developed pollution mitigation plans, which include increasing the number of monitoring stations, improving public transport, and encouraging the use of greener fuels.
In 2018, Greenpeace India ranked Mumbai as the 37th most polluted city in India. Delhi is often considered one of the most polluted cities in the world, but Mumbai's toxicity is considered higher due to the increasing concentration of toxic PM2.5 particles.
