An aeroplane flies over an under-construction building in Mumbai, India, 19 December 2023. Mumbai is facing severe air pollution due to ongoing construction work, including Metro projects, building construction, bridges, road maintenance, as well as vehicular traffic and with climate change. Mumbai's air quality index (AQI) stood at 154, which lies in the 'poor' category, already considered 'unhealthy' for sensitive groups, according to the Central Pollution Control Board.