The national capital’s air quality is deteriorating fast: a 24-hour average AQI of 242 was recorded on Friday morning, marking the fourth consecutive day in the “poor” category. Several areas — like Bawana (310) and Akshardham (369) — have already breached into the “very poor” bracket. 
Vehicular emissions remain the single largest contributor (about 18.7 %) of pollutants, according to the Decision Support System. Stubble burning, construction dust, industrial emissions, and emissions from neighbouring states amplify the problem. Meteorological conditions aren’t helping either: calm winds, temperature inversion, and lack of rain trap pollutants close to the surface.  
In response, authorities have invoked Stage-I of GRAP (Graded Response Action Plan), imposing partial restrictions on construction, emphasizing road watering, dust control, and stricter vehicle emission checks. Health experts warn that vulnerable groups — children, the elderly, those with respiratory or cardiac issues — are already at risk as pollution builds. 
With Diwali’s firecrackers looming, Delhi could slip into “very poor” or worse levels. The challenge will be whether mitigation steps can keep smog from enveloping the city in a toxic haze.