The Air Quality Index in several parts of Delhi remained in the “very poor” category on Tuesday morning, a day after Diwali festivities.

The average AQI at 7.05 am stood at 350, which is categorised as “very poor”, according to data from the Sameer application, which provides hourly updates published by the Central Pollution Control Board.

However, the AQI in several areas was in the “severe” category, including Bawana, where the index stood at 423, Jahangirpuri at 407 and Wazirpur at 408.

An index value between 0 and 50 indicates “good” air quality, between 51 and 100 indicates “satisfactory” air quality and between 101 and 200 indicates “moderate” air quality. As the index value increases further, air quality deteriorates. A value of 201 and 300 means “poor” air quality, while between 301 and 400 indicates “very poor” air.

Between 401 and 450 indicates “severe” air pollution, while anything above the 450 threshold is termed “severe plus”.

Air quality deteriorates sharply in the winter months in Delhi, which is often ranked the world’s most polluted capital. Stubble burning in Punjab and Haryana, along with falling temperatures, decreased wind speeds and emissions from industries and coal-fired plants contribute to the problem.

On October 15, the Supreme Court permitted the sale and use of green firecrackers in the Delhi-NCR region, subject to conditions.

The bench allowed the sale between October 18 and October 21 in designated locations, and limited the use of firecrackers from 6 am to 7 am and between 8 pm and 10 pm.

Green firecrackers are considered less polluting than regular ones as they are made with modified formulations and do not contain harmful elements such as lithium, arsenic, barium and lead.

On Monday, 36 out of the 38 monitoring stations in the national capital recorded pollution levels in the “red zone”, indicating “very poor” to “severe” air quality, PTI reported.

At 10 pm, the city’s overall AQI was “very poor” at 344. Four stations – Dwarka (417), Ashok Vihar (404), Wazirpur (423) and Anand Vihar (404) – recorded “severe” air quality.

A day ahead of Diwali, the Commission for Air Quality Management had on Sunday imposed Stage 2 restrictions under the Graded Response Action Plan to control pollution in Delhi and the adjoining areas in the National Capital Region.

The Graded Response Action Plan is a set of incremental anti-pollution measures that are triggered to prevent further worsening of air quality once it reaches a certain threshold in the Delhi-NCR region.

The second stage of the plan involves a ban on the use of coal and firewood, including tandoors in hotels, restaurants and open eateries. It also includes a ban on the use of diesel generator sets, except for emergency and essential services.

It further comprises measures such as the mechanical sweeping of roads and sprinkling water on them to keep the dust from rising, and intensified inspections for strict dust control measures at construction and demolition sites.

The restrictions under Stage 2 include the curbs under the first stage, which was imposed on October 14.

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