Mumbai's air quality worsened significantly on Friday. The city's Air Quality Index jumped to 130, returning to the moderate category. Worli recorded the highest pollution levels. This deterioration was observed across the Mumbai Metropolitan Region. Experts attribute the change to wind direction and the 'valley effect' from skyscrapers. 
A citizen-led air quality study in Wadala residential high-rises revealed alarming levels of industrial gases, with carbon monoxide and hydrogen sulphide significantly exceeding permissible limits. The research, conducted at elevated floors, also flagged consistent particulate pollution, raising concerns about residents' exposure to emissions. 
