Delhi is once again battling worsening air pollution as the onset of winter brings a familiar deterioration in air quality. The city's Air Quality Index (AQI) - which measures PM2.5, fine particulate matter that can clog lungs - has crossed 300, entering the "very poor" category and raising health concerns for millions of residents. Breathing such polluted air over prolonged periods can cause respiratory problems and worsen existing illnesses, with children and older people particularly vulnerable. Authorities have responded by invoking Stage II of the Graded Response Action Plan (GRAP), introducing measures to curb dust, vehicle emissions and other sources of pollution.
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