Delhi's live AQI stood at 580 on Thursday morning, according to AQI.in, placing it in the 'hazardous' category. Mumbai and Delhi are often compared over infrastructure, economic growth and their ambitions to become global powerhouses. Now, air pollution has become another point of comparison, with the. Delhi has recorded its slowest seasonal deterioration in air quality in seven years, while Mumbai’s pollution has significantly increased. The analysis from Moneycontrol highlights varying patterns.