Air Quality Plunges Ahead of Festive Season

Delhi and the National Capital Region (NCR) woke up to a severe health hazard as the air quality index (AQI) breached the 300 mark, forcing the Commission for Air Quality Management (CAQM) to immediately invoke Stage-II of the Graded Response Action Plan (GRAP). With the regional average AQI registering at 324, authorities have classified the air quality under the "Very Poor" category, setting off emergency protocols weeks ahead of Diwali.

While the national capital typically witnesses the onset of its annual smog season by early October, prolonged monsoon rains and strong surface winds had previously kept the skies clear. However, environmental experts warn that meteorological disruptions, including lingering weather anomalies, could exacerbate pollution levels throughout the approaching winter months.

Emergency Measures Under GRAP-II

The activation of GRAP-II brings forth a stringent array of preventive and corrective actions designed to curb escalating particulate matter emissions. Municipal authorities have been directed to ramp up mechanical and vacuum sweeping of major roadways alongside intensive water sprinkling to suppress dust.

To discourage the reliance on private motor vehicles, parking fees across commercial and municipal lots are slated for an upward revision. Concurrently, public transit systems are stepping up capacity, with increased operational frequencies for Delhi Metro services as well as compressed natural gas (CNG) and electric bus fleets.

These protocols build upon the foundational restrictions of GRAP-I, which was enforced on October 21 when the AQI crossed 244. The foundational measures include aggressive checks on Pollution Under Control (PUC) certificates, stringent bans on diesel vehicles older than 10 years and petrol vehicles older than 15 years, and a strict prohibition on the use of coal and firewood in roadside eateries, commercial tandoors, and diesel generators.

Stubble Burning and Seasonal Compounding

As winter settles over northern India, the crisis is further compounded by agricultural residue burning. Farmers across neighboring Punjab, Haryana, and Uttar Pradesh traditionally initiate stubble burning during this window. This year, however, late-season rainfall has delayed harvesting schedules, pushing the peak window of stubble burning into late October and November.

Environmental analysts note a concerning upward trajectory in winter pollution baselines over recent years. According to researchers tracking clean air metrics, mean winter AQI figures have fluctuated upwards, driven by stagnant atmospheric conditions and calm surface winds that trap smoke over the Indo-Gangetic plain.

As pollution levels edge closer to thresholds that would trigger severe Stage-III and Stage-IV measures—which include potential bans on older commercial four-wheelers and road-rationing schemes like the odd-even rule—residents across the NCR face a challenging winter ahead under an increasingly suffocating haze.