Overview Mumbai is grappling with a significant spike in air pollution, primarily attributed to increased construction activities related to infrastructure projects and rising vehicular pollution. On November 30, 2025 , the average Air Quality Index (AQI) for Mumbai was recorded at 104 , placing it in the 'moderate' category. However, certain areas like the Bandra Kurla Complex experienced 'severe' levels of pollution, raising concerns about public health and environmental management. Key Developments Causes of Air Pollution Construction Activities: Numerous infrastructure projects, including Metro rail lines, road works, and building construction, contribute significantly to dust and particulate matter in the air. Vehicular Emissions: The increasing number of vehicles on the road adds to the pollution levels, especially during peak hours. Temperature Inversion: The transition to winter brings temperature inversion, trapping pollutants near the ground. North-Easterly Winds: These winds, characteristic of the season, contribute to the accumulation of pollutants. Expert Opinions Angshuman Modak , a climate scientist at the Indian Institute of Technology Bombay , emphasized that construction activities and vehicular emissions are the primary sources of the elevated AQI levels. Sushma Nair , a scientist with the India Meteorological Department (IMD), Mumbai , also highlighted the role of infrastructure work and temperature inversion in worsening the air quality. Government Initiatives BMC Measures: The Brihanmumbai Municipal Corporation (BMC) is undertaking several steps to address air pollution, including: Forcing bakeries and crematoriums to use cleaner fuels. Introducing electric buses to reduce vehicular emissions. Managing construction debris scientifically. Using machines for sprinkling water on roads to control dust. Guidelines: In October 2024 , the BMC issued 28 guidelines for construction sites, including: Installing metal fencing and green cloth covering around construction sites. Carrying out water sprinkling. Properly storing and transporting debris. Installing air quality monitoring devices. Setting up smoke absorption systems. Action Against Violators: The BMC issued notices to stop work at 53 construction sites contributing to air pollution. These sites are located in Siddharth Nagar (17) , Mazgaon (5) , and Malad West (31) . AQI Monitoring Systems: There are 662 sensor-based AQI monitoring systems installed across Mumbai, with another 251 in progress. 400 of these systems are integrated with a unified data dashboard. Health Impacts The worsening air quality has both short-term and long-term health impacts. According to the World Health Organisation (WHO) , air pollution is a risk factor for all-cause mortality and specific diseases, including: Stroke Ischaemic heart disease Chronic obstructive pulmonary disease Lung cancer Pneumonia Cataract (household air pollution only) There is also evidence linking air pollution to adverse pregnancy outcomes, other cancers, diabetes, cognitive impairment, and neurological diseases. UPSC Relevance This issue is highly relevant for the UPSC Civil Services Exam, particularly for GS Paper 3 (Environment) and GS Paper 2 (Governance) . It highlights the challenges of balancing urban development with environmental sustainability and the role of government bodies like the BMC in managing environmental issues. Key Concepts for UPSC Air Quality Index (AQI): Understanding the different AQI categories and their implications for public health. Temperature Inversion: Its impact on trapping pollutants and worsening air quality. Sustainable Urban Development: Balancing infrastructure development with environmental protection. Role of Municipal Corporations: The responsibilities of municipal corporations in managing air pollution and implementing environmental regulations.