The use of firecrackers during Diwali, combined with existing seasonal smog and agricultural burning, has led to a significant deterioration in air quality in northern India. Delhi, in particular, recorded an Air Quality Index (AQI) of 391, categorised as 'very poor', ahead of the main celebrations. Poor air quality poses health risks, especially for individuals with respiratory conditions, children, and the elderly. The Supreme Court of India has permitted the limited use of certified green firecrackers in Delhi and surrounding areas to mitigate pollution levels.