The deteriorating air quality poses significant health risks, particularly for residents in northern India, including Delhi and Mumbai. Those with respiratory conditions, children, and the elderly are especially vulnerable to the effects of increased pollution. The 'very poor' AQI levels in Delhi indicate a high likelihood of respiratory discomfort and potential health impacts even for healthy individuals. While Mumbai's air quality has temporarily improved, the use of firecrackers during Diwali could reverse this trend, leading to a surge in pollution levels and associated health risks.