Following the Diwali festivities in 2025, Delhi's air quality has sharply declined, with many areas recording alarming levels of pollution. The Air Quality Index (AQI) in the national capital has reached severe levels, prompting health warnings and the implementation of emergency measures.

On Tuesday morning, the AQI in several regions of Delhi was reported in the 'severe' category, with Bawana at 423, Wazirpur at 408, and Jahangirpuri at 404. The overall AQI for the city was around 451, significantly higher than the national average. The Central Pollution Control Board (CPCB) has indicated that the air quality is expected to worsen further in the coming days.

The CPCB categorises AQI levels as follows: 0-50 is good, 51-100 is satisfactory, 101-200 is moderate, 201-300 is poor, 301-400 is very poor, and 401-500 is severe. Many areas, including Akshardham and India Gate, also reported AQI levels in the very poor to severe range, with readings of 358 and 342, respectively.

Health experts have raised concerns about the potential increase in respiratory diseases and other health issues due to the deteriorating air quality. Dr. Harshal R Salve from AIIMS, New Delhi, stated, "Increased exposure to air pollution has both acute short-term and long-term impacts on health." Vulnerable groups, including children, the elderly, and those with pre-existing conditions, are at greater risk.

In response to the crisis, the Commission for Air Quality Management (CAQM) has activated Stage II of the Graded Response Action Plan (GRAP). This plan includes measures such as restricting the use of coal and firewood in restaurants, increasing parking fees, and enhancing mechanical road cleaning to control dust. Citizens are also encouraged to use public transport and avoid activities that generate dust.

As the city grapples with the aftermath of Diwali fireworks and unfavourable weather conditions, residents are urged to monitor air quality closely and take necessary precautions before heading outdoors. With the air quality expected to remain poor, the need for effective monitoring and public awareness is more critical than ever.